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VirtualBox 4.1.22 and VirtualBox 4.2 released

VirtualBox 4.1.22 is the latest maintenance release or VirtualBox 4.1.
There are following changes:
VMM: fixed a potential host crash triggered by shutting down a VM when another VM was running (only affected 32-bit hosts and 64-bit OS X hosts, 4.1 regression, bug #9897)
VMM: fixed a potential host crash under a high guest memory pressure (seen with Windows 8 guests)
VMM: respect RAM preallocation while restoring saved state.
VMM: fixed handling of task gates if VT-x/AMD-V is disabled
Storage: fixed audio CD passthrough for certain media players
USB: don’t crash if a USB device is plugged or unplugged when saving or loading the VM state (SMP guests only)
RTC: fixed a potential corruption of CMOS bank 1
Mac OS X hosts: installer fixes for Leopard (4.1.20 regression)
Windows Additions: fixed memory leak in VBoxTray (bug #10808)
After upgrade my 4.1.20 to 4.1.22, no automatic upgrade from 4.1.22 to 4.2. You have to download the 4.2 manually and install it.
VirtualBox 4.2.0 is released on 2012-09-13. It is a major update, with following new features.
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 (bug #3653)
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)
Added support for parallel port passthrough on Windows hosts
Enhanced API for controlling the guest; please see the SDK reference and API documentation for more information

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