VirtualBox 4.2 Beta 1 released
Posted on: 08/07/2012 11:40 AM

VirtualBox 4.2 Beta 1 has been released

VirtualBox 4.2 Beta 1 released

Please do NOT use this VirtualBox Beta release on production machines. A VirtualBox Beta release should be considered a bleeding-edge release meant for early evaluation and testing purposes.

You can download the binaries here.

Please do NOT open bug reports at but use our VirtualBox Beta Feedback forum to report any problems with the Beta. Please concentrate on reporting regressions since VirtualBox 4.1.18.

VirtualBox 4.2 will be a new major release. The following major new features were added:

Improved Windows 8 support, in particular many 3D-related fixes
GUI: VM groups (bug #288)
GUI: expert mode for wizards
GUI: allow to alter some settings during runtime
Support for up to 36 network cards, in combination with an ICH9 chipset configuration (bug #8805)
Resource control: added support for limiting network IO bandwidth; see the manual for more information
Added possibility to start VMs during system boot on Linux, OS X and Solaris; see the manual for more information (bug #950)
Added experimental support for Drag'n'drop from the host to Linux guests. Support for more guests and for guest-to-host is planned. (bug #81)

In addition, the following items were fixed and/or added:

VMM: improved VM context switch performance for Intel CPUs using nested paging
VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer)
VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9; bug #9941)
VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. old OS/2 releases)
VMM: support recent VIA CPUs (bug #10005)
GUI: network operations manager
GUI: allow taking screenshots of the current VM window content
GUI: allow automatically sorting of the VM list
GUI: allow starting of headless VMs from the GUI
GUI: allow reset, shutdown and poweroff from the Manager window
GUI: allow to globally limit the maximum screen resolution for guests
GUI: show the full medium part on hovering the list of recently used ISO images
GUI: do not create additional folders when a new machine has a separator character in its name (bug #6541)
GUI: don't crash on terminate if the settings dialog is still open (bug #9973)
Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bug #10491)
Settings: sanitise the name of VM folders and settings file (bug #10549)
Settings: allow to store the iSCSI initiator secret encrypted
E1000: 802.1q VLAN support
Storage: implemented burning of audio CDs in passthrough mode
Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images
Storage: added support for QED images
Storage: added support for QCOW (full support for v1 and readonly support for v2 images)
Storage: added readonly support for VHDX images
Solaris additions: added support for Server 1.11 and 1.12
Windows hosts: no need to recreate host-only adapters after a VirtualBox update
Windows hosts: updated toolchain; make the source code compatible to VC 2010 and enable some security-related compiler options

This list is not complete. This is a first beta and the code still needs some polishing and not all new features are documented yet. Although we already did a lot of testing and don't expect critical regressions, please backup your data before trying this Beta.

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