· Raised the memory limit for VMs on 64-bit hosts to 16GB
· Many fixes for OVF import/export
· VMM: properly emulate RDMSR from the TSC MSR, should fix some NetBSD guests
· IDE: fixed hard disk upgrade from XML-1.2 settings (bug #1518)
· Hard disks: refuse to start the VM if a disk image is not writable
· USB: Fixed BSOD on the host with certain USB devices (Windows hosts only; bug #1654)
· E1000: properly handle cable disconnects (bug #3421)
· X11 guests: prevented setting the locale in vboxmouse, as this caused problems with Turkish locales (bug #3563)
· Linux additions: fixed typo when detecting Xorg 1.6 (bug #3555)
· Windows guests: bind the VBoxMouse.sys filter driver to the correct guest pointing device (bug #1324)
· Windows hosts: fixed BSOD when starting a VM with enabled host interface (bug #3414)
· Linux hosts: do not leave zombies of VBoxSysInfo.sh (bug #3586)
· VBoxManage: controlvm dvdattach did not work if the image was attached before
· VBoxManage showvminfo: don't spam the release log if the additions don't support statistics information (bug #3457)
· GUI: fail with an appropriate error message when trying to boot a read-only disk image (bug #1745)
· LsiLogic: fixed problems with Solaris guests

This version is a major update. The following major new features were added:
· OVF (Open Virtualization Format) appliance import and export
· Host-only networking mode
· Hypervisor optimizations with significant performance gains for high context switching rates
· Raised the memory limit for VMs on 64-bit hosts to 16GB
· VT-x/AMD-V are enabled by default for newly created virtual machines
· USB (OHCI & EHCI) is enabled by default for newly created virtual machines (Qt GUI only)
· Experimental USB support for OpenSolaris hosts
· Shared folders for Solaris and OpenSolaris guests
· OpenGL 3D acceleration for Linux and Solaris guests
· Added C API in addition to C++, Java, Python and Web Services

In addition, the following items were fixed and/or added:
· VMM: FreeBSD guest related fix for V86 flags
· VMM: fixed guru meditation when booting an AsteriskNow Linux VM (bug #2342)
· VMM: fixed PGMPOOLKIND_FREE guru meditation
· VMM: fixed Windows XP boot hang (guest PAE + nested paging only)
· VMM: allow mixing of VT-x/AMD-V and software virtualization
· VMM: fixed extremely slow safe mode booting in e.g. Windows 2008 (VT-x/AMD-V only)
· VMM: significant speedup of certain GRUB boot loaders (e.g. Solaris) (VT-x/AMD-V only)
· VMM: real-mode IOPL fix for DOS guests (VT-x only)
· VMM: fixed VT-x detection with certain BIOSes that enable VT-x, but don’t set the lock bit in MSR_IA32_FEATURE_CONTROL
· VMM: fixed hibernation issues on Windows XP hosts (VT-x only)
· VMM: properly emulate RDMSR from the TSC MSR, should fix some NetBSD guests
· VMM: emulate RDPMC; fixes Windows guests crashes when using the Kaspersky virus scanner
· NAT: fixed truncated downloads (FTP)
· NAT: blocked UDP packets caused a crash
· NAT: allow to configure the next server and the boot file via VBoxManage
· IDE: fixed hard disk upgrade from XML-1.2 settings
· Hard disk: support more VMDK file variants (including fixed-size ESX server images)
· Hard disks: refuse to start the VM if a disk image is not writable
· USB: further reduced host CPU utilization for OHCI and EHCI; the “VBoxInternal/Devices/usb-ohci/0/Config/FrameRate” CFG key is no longer necessary and no longer supported
· USB: fixed BSOD on the host with certain USB devices (Windows hosts only)
· E1000: properly handle cable disconnects
· VRDP: fixed hangs when VRDP server is enabled or disabled in runtime
· Shared folders: respect umask settings on Linux, OSX and Solaris hosts when creating files
· X11 guests: prevented setting the locale in vboxmouse, as this caused problems with Turkish locales
· X11 guests: show the guest mouse pointer at the right position if the virtual desktop is larger than the guest resolution
· Linux additions: fixed typo when detecting Xorg 1.6
· Solaris guests: added xpg4/xcu4 dependency to the guest additions installer
· Windows guests: bind the VBoxMouse.sys filter driver to the correct guest pointing device
· Windows hosts: fixed BSOD when starting a VM with enabled host interface
· Linux hosts: do proper reference counting to prevent unloading the vboxnetflt module as long as this code is in use
· Linux hosts: do not leave zombies of VBoxSysInfo.sh
· Linux installers: fixes for Slackware, Arch Linux and Linux from Scratch systems
· Windows installers: combined installer executable which contains both (32- and 64-bit) architectures.
· VBoxManage: less cryptic command-line error messages
· VBoxManage list vms commands now default to compact format
· VBoxManage controlvm dvdattach did not work if the image was attached before
· VBoxManage: allow creation of all supported disk image variants
· VBoxManage showvminfo: don’t spam the release log if the additions don’t support statistics information
· VBoxManage: big command line processing cleanup, the legacy single-dash options are deprecated and will be removed in the next major release, so switch to the new options now
· Hard disks: improved immutable disk support to auto-reset diff file at VM startup
· GUI: enable the audio adapter by default for new VMs
· GUI: warn if VT-x/AMD-V is not operational when starting a 64-bit guest
· GUI: deactivate 64-bit guest support when the host CPU does not support VT-x/AMD-V
· GUI: removed floppy icon from the status bar
· GUI: show build revision in about dialog
· GUI: fixed sticky status bar text
· GUI: improved error dialogs
· GUI: fail with an appropriate error message when trying to boot a read-only disk image
· GUI/Mac OS X: fixed disabled close button
· GUI/Windows: re-enabled support for copy and paste (Windows hosts 2.0 regression)
· 3D support: added OpenGL select/feedback support
· 3D support: close OpenGL subsystem for terminated guest applications
· 3D support: fixed VM hangs when starting guests with 3D acceleration enabled (bug #3437)
· PXE: fixed boot hangs when hardware virtualization is used
· LsiLogic: fixed problems with Solaris guests
· Main API: close machine settings XML file when unregistering machine