There are numerous benefits of using it for personal computing. In cloud computing, virtual servers which have shared resources are used for computing. Virtualbox can be viewed as a prototype of the virtualization concept in cloud computing. In addition, one can use a virtual box for software testing since it can accommodate more than one operating system. Using a virtual box, one can study the behaviour of malware tools and viruses on a windows computer. It has proven to be very useful for people running tests on their local machine. With virtual box, one can have several operating systems using the resources of one computer. The software makes it possible to run other operation in one machine as a guest OS. * Solaris additions: added support for X.org Server 1.11 and 1.Virtualbox are increasingly becoming popular with most IT professionals all over the world. * USB: don't crash if a USB device is plugged or unplugged when saving or loading the VM state (SMP guests only) * Storage: added readonly support for VHDX images * Storage: added support for QCOW (full support for v1 and readonly support for v2 images) * Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images * Storage: fixed audio CD passthrough for certain media players * Storage: implemented burning of audio CDs in passthrough mode * NAT: fixed memory leak when disabling the NAT engine * NAT: improvements for the built-in TFTP server * Settings: allow to store the iSCSI initiator secret encrypted * Settings: sanitise the name of VM folders and settings file It can be enabled at any time using the VM menu. * Clipboard: disable the clipboard by default for new VMs (see Section 13.3.2.3, “Clipboard”). * Snapshots: fixed a crash when restoring an old snapshot when powering off a VM * GUI: if a bridged network interface cannot be found, don't refuse to start the VM but allow the user to change the setting immediately * GUI: consider scaled DPI values when display fonts on Windows hosts * GUI: don't crash on terminate if the settings dialog is still open * GUI: do not create additional folders when a new machine has a separator character in its name * GUI: show the full medium part on hovering the list of recently used ISO images * GUI: allow to globally limit the maximum screen resolution for guests * GUI: allow reset, shutdown and poweroff from the Manager window * GUI: allow starting of headless VMs from the GUI * GUI: allow automatically sorting of the VM list ![]() * GUI: allow taking screenshots of the current VM window content * VMM: fixed handling of task gates if VT-x/AMD-V is disabled * VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. * VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9) * VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer) * VMM: improved VM context switch performance for Intel CPUs using nested paging * VMM: fixed a potential host crash under a high guest memory pressure (seen with Windows 8 guests) * 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) * Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion # In addition, the following items were fixed and/or added: ![]() ![]() * Enhanced API for controlling the guest please see the SDK reference and API documentation for more information * Added support for parallel port passthrough on Windows hosts ![]() Support for more guests and for guest-to-host is planned. * Added experimental support for Drag'n'drop from the host to Linux guests. * Added possibility to start VMs during system boot on Linux, OS X and Solaris see Section 9.24, “Starting virtual machines during system boot” * Resource control: added support for limiting network IO bandwidth see Section 6.9, “Limiting bandwidth for network I/O” * Support for up to 36 network cards, in combination with an ICH9 chipset configuration * GUI: allow to alter some settings during runtime * Improved Windows 8 support, in particular many 3D-related fixes # The following major new features were added:
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