DownloadBar » Utilities » VirtualBox 4.3.16 Build 95972
VirtualBox represents a free virtualizer for x86 hardware offered for server, desktop and embedded use.

VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

Features of VirtualBox 4.0:
Modularity VirtualBox has an extremely modular design with well-defined internal programming interfaces and a client/server design. This makes it easy to control it from several interfaces at once: for example, you can start a virtual machine in a typical virtual machine GUI and then control that machine from the command line, or possibly remotely. VirtualBox also comes with a full Software Development Kit: even though it is Open Source Software, you don't have to hack the source to write a new interface for VirtualBox.
Virtual machine descriptions in XML The configuration settings of virtual machines are stored entirely in XML and are independent of the local machines. Virtual machine definitions can therefore easily be ported to other computers.
Guest Additions for Windows and Linux VirtualBox has special software that can be installed inside Windows and Linux virtual machines to improve performance and make integration much more seamless. Among the features provided by these Guest Additions are mouse pointer integration and arbitrary screen solutions (e.g. by resizing the guest window).
Shared folders Like many other virtualization solutions, for easy data exchange between hosts and guests, VirtualBox allows for declaring certain host directories as "shared folders", which can then be accessed from within virtual machines.

A number of extra features are available with the full VirtualBox release only:
Virtual USB Controllers VirtualBox implements a virtual USB controller and allows you to connect arbitrary USB devices to your virtual machines without having to install device specific drivers on the host.
Remote Desktop Protocol Unlike any other virtualization software, VirtualBox fully supports the standard Remote Desktop Protocol (RDP). A virtual machine can act as an RDP server, allowing you to "run" the virtual machine remotely on some thin client that merely displays the RDP data.
USB over RDP With this unique feature, a virtual machine that acts as an RDP server can still access arbitrary USB devices that are connected on the RDP client. This way, a powerful server machine can virtualize a lot of thin clients that merely need to display RDP data and have USB devices plugged in.
What's New in VirtualBox 4.3.16 Build 95972:

– VMM: fixed restoring of the auxiliary TSC MSR in VT-x that caused host BSODs on Windows 8.1 hosts and unpredictable behavior on other hosts (bug #12237)
– VMM: provide fake values for a couple of MSRs to make more guests happy on certain hosts
– VMM: fixed detection of VT-x on certain machines where the BIOS would not set the VMX LOCK feature bit, which affected the VM settings in the GUI
– VMM: fixed TPR threshold which caused BSODs on Windows XP guests that use the I/O APIC (VT-x only; bug #12227)
– VMM: fixed PATM saved state incompatibility for software virtualized VMs (bug #12222)
– VMM: don’t fail if AMD-V isn’t available if the VM is configured to use software virtualization
– GUI: fixed guest resize breakage on visual representation mode change (when switching from normal to fullscreen etc)
– GUI: make sure the guest screen is resized after restoring a VM from a saved state if the host screen size changed
– GUI: disabled SCROLL LED sync from HID LEDs synchronization (Mac OS X hosts only)
– Webcam passthrough improvements including GUI support (see the manual for more information)
– Guest Control: implemented more IGuestSession methods
– Guest Control: added support for deleting and renaming guest files + directories in VBoxManage
– Guest Control: various bugfixes
– API: incorrect handling of hardware UUID default value, resulting in an all zero DMI/SMBIOS UUID, which leads to Windows requesting re-activation (4.3 regression; bug #12244)
– 3D support: fixed crash on shutdown if 2D video acceleration is enabled (Mac OS X hosts only)
– 3D support: miscellaneous fixes
– Storage: fixed detection of CD/DVD media when switching from an empty to a host drive with passthrough enabled
– Storage: fixed hang of the VM process when the disk is full under certain circumstances
– NAT: listen for changes of NAT Network setting at runtime
– NAT: NAT Network DHCP server now saves leases to a persistent storage
– Main: monitor changes in host DNS configuration
– Mac OS X host: reworked a mechanism of adding a VM desktop alias from the VM selector
– Mac OS X installer: remove old kernel extensions during upgrade (bug #12258)
– Linux Additions: correctly set umask before installing (bug #12166)
– X11 Additions/3D: fix freezes starting 3D desktop (bug #11503, thank you Sam Spilsbury)
– X11 Additions/3D: fix depth buffer support (bug #11905)
– X11 Additions/3D: fix Age Of Empires 3 rendering (bug #11331)
– indows Additions/3D: fix Google Earth plugin rendering
– Windows Additions/WDDM: autoresize fixes

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