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Changelog for VirtualBox 4.0
This page lists all changes of the VirtualBox 4.0 releases.
All branches: 5.0 · 4.3 · 4.2 · 4.1 · 4.0 · 3.2 · 3.1 · 3.0 · 2.2 · 2.1 · 2.0 · 1.6

VirtualBox 4.0.30 (released 2015-05-19)

This is a maintenance release. The following items were fixed and/or added:

VRDP: fixed incompatibility with rdesktop 1.8.3
Floppy: several fixes
VirtualBox 4.0.28 (released 2015-01-17)

This is a maintenance release. The following items were fixed and/or added:

VRDP: fixed a rare crash when using remote audio input
Storage: fixed data corruption when resizing VHD images under certain circumstances
VirtualBox 4.0.26 (released 2014-07-15)

This is a maintenance release. The following items were fixed and/or added:

HGCM: fixed a problem with saved states which could cause several guest misbehavior after a VM was started from a saved state
VirtualBox 4.0.24 (released 2014-03-14)

This is a maintenance release. The following items were fixed and/or added:

3D: several fixes
Additions: fixed CPU hot-remove on newer Linux kernels
VirtualBox 4.0.22 (released 2014-01-10)

This is a maintenance release. The following items were fixed and/or added:

HGCM: fixed crashes under certain conditions
Linux Additions: fixes for recent Linux kernels
Windows Additions: fixed guest crashes in in Shared Folders service under certain conditions
VirtualBox 4.0.20 (released 2013-10-11)

This is a maintenance release. The following items were fixed and/or added:

GUI: prevent crashes under certain conditions on X11 hosts
VRDP: fixed a rare crash on the guest screen resize
Storage: fixed data corruption after resizing a VDI image under certain circumstances (bug #11344)
Storage: fixed crash when connecting to certain QNAP iSCSI targets
Storage: fixed lost writes if iSCSI is used with snapshots and ansyc I/O (bug #11479)
Storage: fixed hang when creating a snapshot using Parallels disk images (bug #9617)
VBoxSVC: don't crash on systems with many VLAN interfaces
Main/OVF: don't crash during import if the client forgot to call Appliance::interpret() (bug #10845)
VBoxManage: don't crash during screenshotpng if there is no display (bug #11363)
Linux hosts: work around gcc bug 55940 which might lead to wrong kernel module code if gcc 4.7 is used to compile the 32-bit Linux host kernel (bug #11035)
Linux hosts: made "]" key work again on Japanese keyboards.
Linux hosts / guests: Linux 3.11 fixes (bug #11946, #12001)
Solaris / Mac OS X hosts: VM CPU load metrics now report 100% when all cores are fully utilized (used to be a single core)
Linux Additions: Linux 3.8 / 3.9 compile fixes (bug #11036)
Linux Additions: RHEL/OEL/CentOS 6.4 compile fix (bug #11586)
Linux Additions: Debian Linux kernel 3.2.0-4 (3.2.39) compile fix (bug #11634)
VirtualBox 4.0.18 (released 2012-12-18)

This is a maintenance release. The following items were fixed and/or added:

VMM: fixed VERR_NOT_SUPPORTED and VERR_RAW_MODE_INVALID_SMP guru meditation due to an invalid reschedule to raw mode (bug #10370)
VMM: fixed a potential problem causing to schedule interrupts during SYSEXIT right after STI
VMM: fixed a VM hang after a resume from pause / savestate with SMP guests in rare cases
VMM: fixed a potential guest memory corruption issue in page fusion
VMM: fixed host freezes with 64-bit guests on 32-bit Linux hosts (bug #10528)
VMM: fixed an interpretion bug for TPR read instructions under rare conditions (AMD-V only)
VMM: fixed handling of task gates if VT-x/AMD-V is disabled
Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bug #10491)
Main: host interfaces no longer have "defaults" for ip address and network mask attributes
Network: fixed the problem with packets larger than MTU-4 when PCnet or PRO/1000 was bridged to certain types of adapters on OS X host (bug #3783)
Bridged Networking: fixed the problem with device driver unloading on kernels 3.2.18 and newer due to invalid reference counter (bug #10624)
NAT: fixed a crash under rare circumstances (Windows hosts only; bug #10128)
Virtio-net: fixed the problem with receiving of GSO packets in Windows XP guests causing packet loss in host-to-VM transfers
Virtio-net: fixed the problem with network statistics counters in Session Information dialog (GUI)
Storage: fixed a possible data corruption when compacting VDI images with snapshots
Storage: fixed audio CD passthrough for certain media players
Storage: fixed hang in case of unaligned requests and async I/O enabled
Storage: fixed hang with newer VHD images (bug #11279)
VGA: fixed wrong access check which might cause a crash under certain conditions
VGA: fix for double scan text modes
USB: don't crash if a USB device is plugged or unplugged when saving or loading the VM state (SMP guests only)
VBoxManage: fixed memory leak when executing and waiting for a guest process
VBoxManage: fixed converting disks from raw images
Solaris installer: fixed dependency checking while installing VirtualBox in a zone
Linux hosts / guests: fixes for Linux 3.3, 3.4, 3.5 and 3.7
Linux Additions: make 3D passthrough work on OEL/RHEL 6.2 (bug #10010)
Linux Additions: fixed missing implementation when copying shared folder data through kernel high memory (bug #9878)
Linux Additions: make sure all data is written when closing a memory mapped file on a shared folder
Linux Additions: the guest content was sometimes not properly updated (bug #9887)
Solaris Additions: fixed guest kernel driver to load properly on guest reboot (4.1.8 regression; bug #10113)
Solaris Additions: fixed missing 64-bit OpenGL library VBoxOGL.so (bug #10151)
Windows Additions, VRDP: fixed occasional corruption of vertical text
VirtualBox 4.0.16 (released 2012-01-11)

This is a maintenance release. The following items were fixed and/or added:

VRDP: fixed screen corruption
VRDP: fixed screen freeze
ATA: fixed a possible crash during ATAPI passthrough with certain guests
NAT: the interface stopped working after a lot of failed ICMP requests (bug #9371)
Metrics: fixed potential problem with invalid access in guest metrics collection upon VM destruction
Main: fixed incorrect framebuffer information after leaving the fullscreen mode with X11 guests, this lead to a scrambled preview window in the GUI for example
VBoxSVC: fixed crash under rare circumstances (e.g. client crash)
VMDK/VHD: fixed a possible corruption with host cache disabled when using snapshots under rare circumstances (bug #9749)
OVF/OVA: fixed broken disk images on import under rare circumstances
Mac OS X hosts: fixed the problem with duplicate packets when bridged to wireless interface (bug #9648)
Windows Additions: implemented faster detection of logged-in guest users and stale sessions
Linux guests: fixes for Linux 3.2
VirtualBox 4.0.14 (released 2011-10-18)

This is a maintenance release. The following items were fixed and/or added:

VMM: fixed 64bit guests on AMD Fusion CPUs (bug #8824)
VMM: fixed handling of the sysenter/sysexit machine instructions in 64-bit guests on Intel hosts
GUI: fixed the inclusion of additional information (license, vendor, ...) on OVF export
GUI: when taking a snapshot from the VM selector, don't do a live snapshot
GUI: fixed spurious LCtrl key events on some Windows hosts (4.0.6 regression; bug #373)
VBoxManage: fixed extpack install --replace
VRDP: fixed a rare screen corruption
E1000: fixed rare Windows 7 guest hangs, either at boot time or when reconfiguring the network card in unusual setups (bug #6223)
Mouse support: fixed an off-by-one pointer position error affecting Windows guests (bugs #7566, #9321)
NAT: changed TCP connection establishment according to Winsock API requirements (Windows hosts only; bug #8919)
VHD: fixed reads crossing block boundaries (bug #8532)
VMDK: fixed progress indicator when creating split VMDK images
Floppy: fixed medium size detection for physical mediums (Windows hosts only)
VBoxSVC: made the path comparison OS independent when images are registered (bug #9303)
Main: return the correct RDP default port fixing settings warnings in the GUI if the remote display was enabled at runtime (bug #9368)
Main: fix VM initialization if a shared folder does not exist (bug #7941)
Main: fixed taking screen shots (e.g. the preview window) for headless VMs if the Guest Additions are active
Main: fixed possible deadlock between hard disk enumeration and the resetting of immutable disks (bug #9549)
OVA: fixed import of renamed OVA files (bug #9033)
Virtio-net: fixed the problem with UDP packets exceeding MTU (bug #9370)
Solaris hosts: fixed starting EFI guests due to missing EFI ROM files (bug #9535)
Mac OS X hosts: fix installation issues when installed as root (bug #1578)
Windows Additions: fixed file truncation on a shared folder with some applications (bugs #9276, #9315)
Linux Additions: suppress an incorrect error message and allow a shared folder to be mounted in multiple places (bug #9627)
Linux Additions: add support for X.Org Server 1.11 (bug #9519)
Linux Additions: fixed llseek for Linux kernels 2.6.37 and above
Linux Additions: start VBoxService correctly on openSUSE 12.1 (bug #6229)
Linux Additions: properly finish the installation even if the compilation of the DRM module fails (which is not fatal)
VirtualBox 4.0.12 (released 2011-07-15)

This is a maintenance release. The following items were fixed and/or added:

Mac OS X hosts: Lion fixes
Solaris hosts: fixed preemption issue with Solaris 11 hosts (builds 166 and above)
VBoxManage: more convenient configuration of storage controller attachments by automatically determining the port or device parameter when a storage controller has only one port or device per port (bug #9188)
Storage: fixed possible data corruption under certain circumstances whith VHD and Parallels images (bug #9150)
Storage: fixed access to CD/DVD images beyond 4GB when using the SATA controller (bug #8592)
Floppy: make it possible to unmount a host floppy disk (bug #6651)
Networking: fixed the problem with segmentation offloading when several VMs were transmitting at once
3D support: fixed GL_VERSION string for different locales (bug #8916)
Sources: fixed USB 2.0 support using extension packs for non-official builds
Solaris Additions: fixed automounting of shared folders (bug #8014)
VirtualBox 4.0.10 (released 2011-06-27)

This is a maintenance release. The following items were fixed and/or added:

GUI: fixed disappearing settings widgets on KDE hosts (bug #6809)
Storage: fixed hang under rare circumstances with flat VMDK images
Storage: a saved VM could not be restored under certain circumstances after the host kernel was updated (bug #8983)
Storage: refuse to create a medium with an invalid variant (for example Split2G with VDI; bug #7227)
Snapshots: none of the hard disk attachments must be attached to another VM in normal mode when creating a snapshot
USB: fixed occasional VM hangs with SMP guests (bug #4580)
USB: proper device detection on RHEL/OEL/CentOS 5 guests (partial fix for bug #8978)
ACPI: force the ACPI timer to return monotonic values for improve behavior with SMP Linux guests (bug #8511 and others)
RDP: fixed screen corruption under rare circumstances (bug #8977)
rdesktop-vrdp: updated to version 1.7.0
OVF: under rare circumstances some data at the end of a VMDK file was not written during export
Mac OS X hosts: Lion fixes (bug #8903)
Mac OS X hosts: GNOME 3 fix
Linux hosts: fixed VT-x detection on Linux 3.0 hosts (bug #9071)
Linux hosts: fixed Python 2.7 bindings in the universal Linux binaries
Windows hosts: fixed leak of thread and process handles
Windows Additions: fixed bug when determining the extended version of the Guest Additions (4.0.8 regression; bug #8948)
Solaris Additions: fixed installation to 64-bit Solaris 10u9 guests (4.0.8 regression)
Linux Additions: RHEL6.1/OL6.1 compile fix
Linux Additions: fixed a memory leak during VBoxManage guestcontrol execute (bug #9068)
VirtualBox 4.0.8 (released 2011-05-16)

This is a maintenance release. The following items were fixed and/or added:

Mac OS X hosts: fixed incompatibility with recent Mac OS X versions in 64-bit mode (bug #8474)
Mac OS X hosts: fixed incompatibility with hosts with more than 16 cores (bug #8389)
Mac OS X hosts: fixed painting corruptions on a second monitor in 64-bit mode (bug #7606)
GUI: restored functionality to set an empty host key to disallow any host key combination (4.0.6 regression; bug #8793)
VBoxManage: added controlvm screenshotpng subcommand for saving the screenshot of a running VM in PNG format
VBoxHeadless: fixed potential crash during shutdown (Windows hosts only)
NAT: built-in services use the correct Ethernet addresses in Ethernet header and in ARP requests
Host-only networking: fixed adapter reference counting
E1000: fixed rare guest crashes with Linux SMP guests (bug #8755)
SATA: fixed guest disk corruption under rare circumstances (only relevant for guests with more than 2GB RAM; bug #8826)
Storage: fixed data corruption after a snapshot was taken with asynchronous I/O enabled (bug #8498)
Floppy: several improvement
HPET: another fix for time jumps (bug #8707)
USB: removed assumption that string descriptors are null-terminated (Windows hosts only)
3D support: fixed a potential crash when resizing the guest window
3D support: fixed GNOME 3 rendering under Ubuntu 11.04 and Fedora 15
Snapshots: fixed another bug which could lose entries in the media registry when restoring a snapshot (bug #8363)
Shared Folders: don't stop mounting the other valid folders if one host folder is inaccessible (4.0.6 regression)
Linux Additions: check whether gcc and make are installed before building kernel modules (bug #8795)
Solaris Additions: added support for X.Org Server 1.10
Guest Additions: fixed inappropriate Guest Additions update notification when using vendor-specific version suffixes (bug #8844)
VirtualBox 4.0.6 (released 2011-04-21)

This is a maintenance release. The following items were fixed and/or added:

VMM: fixed incorrect handling of ballooned pages when restoring a VMM from a saved state
VMM: don't crash on hosts with more than 64 cores / hyperthreads; implemented support for up to 256 host cores (except Windows hosts; bug #8489)
VMM: fixed guru meditation for PAE guests running on hosts without PAE (bug #8006)
VMM: fixed slow Linux guests with raw mode and recent guest kernels (bug #8726)
GUI: support host key combinations (bug #979)
GUI: fixed progress indicator (bug #7814)
GUI: show the mouse pointer while the VM is paused if the USB tablet mouse emulation is used (bug #6799)
GUI: adapt the snapshot folder as well when renaming a VM (bug #8469)
GUI: persistently remember the last folders of the disk/DVD/floppy selectors
GUI: never allow to start a VM with USB-2.0 activated if the proper extension pack is missing (bug #8182)
GUI: fixed hang/crash when opening a file dialog in an non-existing folder (bug #8673)
Snapshots: fixed a bug which could lose entries in the media registry when restoring a snapshot (bug #8363)
Snapshots: allow snapshots to be stored in the VM directory
3D support: fixed a crash if a VM was forced to terminate (Windows hosts only; bug #7133)
Storage: fixed memory leak (4.0 regression; bug #7966)
Storage: fixed access to iSCSI targets over internal network
Storage: fixed reading from disks with more than one snapshot for VHD and VMDK images with disabled host cache (bug #8408)
Storage: fixed a possible hang during VM suspend after an I/O error occurred
Storage: fixed a possible hang during VM suspend / reset (bug #8276, #8294)
Storage: automatically create a diff image when attaching a streamOptimized VMDK image to a VM
ATA/SATA: fixed automounting of virtual CD/DVD mediums with recent Linux distributions by correctly reporting the current profile as 'none' if no medium is present
Buslogic: fixed emulation for certain guests (e.g. jRockit VE)
Host-Only Networking: fixed interface creation failure on Windows hosts (4.0.4 regression; bug #8362)
Host-Only & Bridged & Internal Networking: fix for processing promiscuous mode requests by VMs, defaulting to switch behaviour
Host-Only Networking: fixed connectivity issue after resuming the host from sleep (bug #3625)
Bridged Networking: support for interface bonding on Mac OS X hosts (bug #8731)
NAT: fixed processing of ARP announcements for guests with static assigned IPs (bug #8609)
VRDP: backward compatibility with VRDPAuth external authentication library (bug #8063)
Shared Folders: don't fail to start a VM if a path is not absolute, for example when importing an OVF from a different host (bug #7941)
Audio: fixed crash under certain conditions (bug #8527)
USB: fixed a crash when plugging certain USB devices (bug #8699)
HPET: fixed time jumps when reading the counter (bug #8707)
OVF/OVA: automatically adjust disk paths if the VM name is changed on import
OVF/OVA: fix export to slow medias
OVF/OVA: automatically repair inconsistent appliances with multiple disks (bug #8253)
rdesktop-vrdp: fixed an assertion triggered under certain conditions (bug #8593)
Windows hosts: fixed occasional hangs during VM shutdown because sometimes COM was not properly uninitialized
Mac OS X hosts: prevent the mouse from leaving the VM window while captured
Mac OS X hosts: keep aspect ratio while resizing in scale mode (shift for old behaviour) (part of bug #7822)
X11 hosts: fixed Yen key support (bug #8438)
X11 hosts: fixed a regression which caused Host+F1 to pop up help instead of sending Ctrl+Alt+F1
Linux hosts / Linux Additions: mangle IPRT symbols to allow installing VirtualBox inside a VM while the Guest Additions are active (bug #5686)
Linux hosts / Linux guests: workaround for a bug in GLIBC older than version 1.11 leading to crashes under certain conditions (signed/unsigned problem with memchr on 64-bit machines)
Solaris hosts: fixed a deadlock in event semaphores that could lead to unkillable VM processes
Windows Additions: fixed Sysprep parameter handling
Windows Additions: fixed spontaneous guest reboots under certain circumstances (4.0.2 regression; bugs #8406, #8429)
Windows Additions: added auto logon support for locked workstations on legacy Windows versions
Windows Additions: fixed driver bugcheck error when handling PnP messages (4.0 regression; bug #8367)
Windows Additions: fixed memory leak in VBoxVideo
X11 Additions: added support for X.Org Server 1.10 final
Linux Additions: Linux kernel 2.6.39-rc1 fixes
Linux Additions: improved auto-run support (bug #5509)
Linux Additions: fix mouse support on SUSE 11 SP 1 guests (bug #7946)
Solaris Additions: added support for X.Org Server 1.9
Guest Additions: various bugfixes for guest control execution
Webservice: use own log file, with log rotation to limit size
VirtualBox 4.0.4 (released 2011-02-17)

This is a maintenance release. The following items were fixed and/or added:

VMM: fixed recompiler crashes under certain conditions (bugs #8255, #8319 and further)
VMM: fixed running 64-bit guests on 32-bit host with nested paging enabled on AMD CPUs (4.0 regression; bug #7938)
VMM: fixed timing issues / hangs for certain guests using the programmable interval timer (bugs #8033 and #8062)
VMM: large page and monitoring fixes for live snapshots (bugs #7910, #8059, #8125)
GUI: fixed error message when trying to exceed the maximum number of host network interfaces
GUI: fixed saving of changes to the metadata of an existing snapshot (bug #8145)
GUI: fixed rare crash on X11 hosts (bug #8131)
GUI: when selecting a shared folder, start the file dialog in the users home directory (bug #8017)
ExtPack: enforce the correct permissions which might be restricted by umask when creating directories (non-Windows hosts only; bug #7878)
VBoxSDL: fixed crash when starting by specifying the VM UUID (4.0 regression; bug #8342)
VBoxManage: allow savestate even if the VM is already paused
VBoxManage: fixed modifyvm --synthcpu (bug #6577)
VBoxManage: fixed hang when doing guestcontrol execute –wait-for exit and displaying process status on exit (bug #8235)
VBoxManage: decreased CPU load during guestcontrol execute –wait-for exit/stdout while waiting for the guest process to terminate (bug #7872)
VBoxManage: fixed list hostdvds/host?oppies
VBoxManage: fixed storageattach for host DVD drives and host ?oppy drives
Metrics: introduced RAM/VMM base metric.
Main: improved sanity check when taking a VM screen shot (bug #7966)
Main: fixed a crash under rare circumstances if a VM failed to start
Main: fixed attaching of immutable disk images (bug #8105)
Main: fixed a crash at VM shutdown (bug #6443)
Main: fixed incorrect handling of cross-referenced medium attachments (bug #8129)
Settings: fixed truncating of big integer values (4.0 regression)
Settings: properly store the ICH9 chipset type (bug #8123)
Host-Only & Bridged Networking: fixed VBox DHCP server startup issue for Windows hosts (4.0 regression; bug #7905)
Host-Only Networking: re-create vboxnetX interfaces after vboxnetadp.ko module reload on Linux and Darwin (bugs #5934, #6341)
NAT: fixed an mbuf leak under rare circumstances (bug #7459)
ACPI: don’t allow the guest to enter S4 by default and don’t announce S1 and S4 in the ACPI tables if disabled (bug #8008)
Graphics card: made re-enabling disabled screens work correctly to prevent problems when X11 guests enter screen saving mode (bug #8122)
Storage: fixed write errors with snapshots if the host cache is disabled (4.0 regression; bug #8221)
ATA/SATA: fixed reset handling after ACPI suspend/resume
BusLogic: fixed hang with SMP VMs
Serial: another attempt to prevent lost characters during transmission (bug #1548)
Linux hosts/guests: Linux 2.6.38-rc1 compile fixes
Mac OS X hosts: fixed VBoxSVC crash when listing host interfaces without default gateway (64-bit hosts only; bug #7955)
Solaris/Darwin hosts: fixed VM CPU execution cap
X.Org guests: fixed a crash on X server restart (bug #8231)
X.Org guests: support X.Org Server 1.10 pre-release and Ubuntu 11.04 Alpha.
X.Org guests: Add EDID emulation in the graphics driver to prevent GNOME settings daemon changing the mode on login.
X.Org guests: never send graphics modes to the host that older VirtualBox versions can’t handle.
Linux Additions: fixed a memory leak in the shared folders code if a host link is not readable (bug #8185)
Windows Additions: fixed handling of Security Attention Sequence (SAS) with VBoxGINA
VirtualBox 4.0.2 (released 2011-01-18)

This is a maintenance release. The following items were fixed and/or added:

GUI: don't crash if a removable host drive referenced from the VM settings vanished
GUI: fixed a crash when using the KDE4 Oxygen theme and clicked on the settings button (4.0 regression; bug #7875)
GUI: properly warn if the machine folder cannot be created (bug #8031)
GUI: several fixes for multimonitor X11 guests
ExtPack: don’t make the installer helper application suid root (Linux .deb/.rpm packages only)
ExtPack: improved user experience on Vista / Windows 7 when installing an extension pack
ExtPack: fixed issue with non-ascii characters in the path name during installing an extension pack (bug #7917)
ExtPack: fixed SELinux issues on 32-bit Linux hosts
VBoxManage: Host-only interface creation and removal is now supported for all platforms except Solaris (bug #7741)
VBoxManage: fixed segmentation fault when removing non-existent host-only interface
Storage: fixed possible crashes with VMDK/VHD images with snapshots and async I/O (4.0 regression)
Storage: don’t eject the physical medium if a DVD/CDROM/?oppy drive is detached from a VM (bug #5825)
Storage: be more robust when a faulty guest sends ATA commands to an ATAPI device (bug #6597)
Parallels: fixed deletion of the image during suspend, pause or power off (4.0 regression)
Bridged networking: fixed host kernel panic when bridging to devices with no TX queue (4.0 regression; Linux hosts only; bug #7908)
NAT: port-forwarding rule registration respects protocol parameter (bug #8094)
E1000: fixed PXE boot issues with WDS (bug #6330)
Virtio-net: fixed the issue with TX performance in some Linux guests
ICH9: fixed VM crash (software virtualization only; bug #7885)
VGA: fixed VESA screen issue (4.0 regression; bug #7986)
Shared Folders: fixed parameter parsing when creating symbolic links, fixes 32-bit/64-bit bitness issue (bug #818)
Main: fixed crash under rare circumstances due to an invalid logging string (4.0 regression)
Main: improve error information propagation for errors preventing a VM start
Main: fixed problems with snapshots and non-ASCII characters in machine paths (bug #8024)
Webservice: now listens to localhost by default as documented (bug #6067)
Settings: do not fail loading machine settings if removeable drive attachment (host drive or image) cannot be found; with 4.0 this is much more likely when machines are moved from one host to another
Settings: fixed issue that changing a snapshot name or description was not saved to machine XML
OVF/OVA: fixed import of files created by other OVF tools (bug #7983)
rdesktop-vrdp: fix a crash during USB device enumeration (bug #7981)
Linux hosts: fixed a crash during USB device enumeration.
Linux hosts: try a bit harder to allocate memory (bug #8035; 4.0 regression)
Guest Additions: fixed parsing of parameters for guest control in VBoxService (4.0 regression; bug #8010)
Windows Guest Additions: automatic logon on Windows Vista/Windows 7 now supports unlocking previously locked workstations
VirtualBox 4.0.0 (released 2010-12-22)

This version is a major update. The following major new features were added:

Reorganization of VirtualBox into a base package and Extension Packs; see chapter 1.5, Installing VirtualBox and extension packs, see the manual for more information
New settings/disk file layout for VM portability; see chapter 10.1, Where VirtualBox stores its files, see the manual for more information
Major rework of the GUI (now called “VirtualBox Manager”):
Redesigned user interface with guest window preview (also for screenshots)
New “scale” display mode with scaled guest display; see chapter 1.8.5, Resizing the machine’s window, see the manual for more information
Support for creating and starting .vbox desktop shortcuts (bug #1889)
The VM list is now sortable
Machines can now be deleted easily without a trace including snapshots and saved states, and optionally including attached disk images (bug #5511; also, VBoxManage unregistervm --delete can do the same now)
Built-in creation of desktop file shortcuts to start VMs on double click (bug #2322)
VMM: support more than 1.5/2 GB guest RAM on 32-bit hosts
New virtual hardware:
Intel ICH9 chipset with three PCI buses, PCI Express and Message Signaled Interrupts (MSI); see chapter 3.4.1, “Motherboard” tab, see the manual for more information
Intel HD Audio, for better support of modern guest operating systems (e.g. 64-bit Windows; bug #2785)
Improvements to OVF support (see chapter 1.12, Importing and exporting virtual machines, see the manual for more information):
Open Virtualization Format Archive (OVA) support
Significant performance improvements during export and import
Creation of the manifest file on export is optional now
Imported disks can have formats other than VMDK
Resource control: added support for limiting a VM’s CPU time and IO bandwidth; see chapter 5.8, Limiting bandwidth for disk images, see the manual for more information
Storage: support asynchronous I/O for iSCSI, VMDK, VHD and Parallels images
Storage: support for resizing VDI and VHD images; see chapter 8.21, VBoxManage modifyhd, see the manual for more information.
Guest Additions: support for multiple virtual screens in Linux and Solaris guests using X.Org server 1.3 and later
Language bindings: uniform Java bindings for both local (COM/XPCOM) and remote (SOAP) invocation APIs
In addition, the following items were fixed and/or added:

VMM: Enable large page support by default on 64-bit hosts (applies to nested paging only)
VMM: fixed guru meditation when running Minix (VT-x only; bug #6557)
VMM: fixed crash under certain circumstances (Linux hosts only, non VT-x/AMD-V mode only; bugs #4529 and #7819)
GUI: add configuration dialog for port forwarding in NAT mode (bug #1657)
GUI: show the guest window content on save and restore
GUI: certain GUI warnings don’t stop the VM output anymore
GUI: fixed black fullscreen minitoolbar on KDE4 hosts (Linux hosts only; bug #5449)
BIOS: implemented multi-sector reading to speed up booting of certain guests (e.g. Solaris)
Bridged networking: improved throughput by filtering out outgoing packets intended for the host before they reach the physical network (Linux hosts only; bug #7792)
3D support: allow use of CR_SYSTEM_GL_PATH again (bug #6864)
3D support: fixed various clipping/visibility issues (bugs #5659, #5794, #5848, #6018, #6187, #6570)
3D support: guest application stack corruption when using glGetVertexAttrib[ifd]v (bug #7395)
3D support: fixed OpenGL support for libMesa 7.9
3D support: fixed Unity/Compiz crashes on natty
2D Video acceleration: multimonitor support
VRDP: fixed rare crash in multimonitor configuration
VRDP: support for upstream audio
Display: fixed occasional guest resize crash
NAT: port forwarding rules can be applied at runtime
SATA: allow to attach CD/DVD-ROM drives including passthrough (bug #7058)
Floppy: support readonly image files, taking this as the criteria for making the medium readonly (bug #5651)
Audio: fixed memory corruption during playback under rare circumstances
Audio: the DirectSound backend now allows VMs to be audible when another DirectSound application is active, including another VM (bug #5578)
EFI: support for SATA disks and CDROMs
BIOS: reduce the stack usage of the VESA BIOS function #4F01 (Quake fix)
OVF/OVA: fixed export of VMs with iSCSI disks
Storage: Apple DMG image support for the virtual CD/DVD (bug #6760)
Linux host USB support: introduced a less invasive way of accessing raw USB devices (bugs #1093, #5345, #7759)
Linux hosts: support recent Linux kernels with CONFIG_DEBUG_SET_MODULE_RONX set
Guest Additions: Shared Folders now can be marked as being auto-mounted on Windows, Linux and Solaris guests
Linux Additions: Shared Folders now support symbolic links (bug #818)
Linux Additions: combined 32-bit and 64-bit additions into one file
Windows Additions: automatic logon on Windows Vista/Windows 7 is now able to handle renamed user accounts; added various bugfixes
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