VirtualBox is a general-purpose full virtualizer for hardware. Targeted at server, desktop and embedded use, it is now the only professional quality virtualization solution that is also Open Source Software. VirtualBox is a powerful virtualization product for enterprise as well as home use. VirtualBox provides are useful for several scenarios: Running multiple operating systems simultaneously. VirtualBox allows you to run more than one operating system at a time. This way, you can run software written for one operating system on another (for example, Windows software on Linux or a Mac) without having to reboot to use it. Since you can con?gure what kinds of "virtual" hardware should be presented to each such operating system, you can install an old operating system such as DOS or OS/2 even if your real computer's hardware is no longer supported by that operating system. Software vendors can use virtual machines to ship entire software con?gurations. For example, installing a complete mail server solution on a real machine can be a tedious task. With VirtualBox, such a complex setup (then often called an "appliance") can be packed into a virtual machine. Installing and running a mail server becomes as easy as importing such an appliance into VirtualBox.
Testing and disaster recovery. Once installed, a virtual machine and its virtual hard disks can be considered a "container" that can be arbitrarily frozen, woken up, copied, backed up, and transported between hosts. On top of that, with the use of another VirtualBox feature called "snapshots", one can save a particular state of a virtual machine and revert back to that state, if necessary. This way, one can freely experiment with a computing environment. If something goes wrong (e.g. after installing misbehaving software or infecting the guest with a virus), one can easily switch back to a previous snapshot and avoid the need of frequent backups and restores. Any number of snapshots can be created, allowing you to travel back and forward in virtual machine time. You can delete snapshots while a VM is running to reclaim disk space.
Infrastructure consolidation. Virtualization can signi?cantly reduce hardware and electricity costs. Most of the time, computers today only use a fraction of their potential power and run with low average system loads. A lot of hardware resources as well as electricity is thereby wasted. So, instead of running many such physical computers that are only partially used, one can pack many virtual machines onto a few powerful hosts and balance the loads between them.
This is a maintenance release. The following items were fixed and/or added:
GUI: the USB filter settings dialog should allow to specify the USB revision in hexadecimal format (bug #15400) GUI: fixed crash on certain hosts when pressing certain key combinations (Windows hosts only; bug #15719) GUI: fixed issue with updating the available-geometry on host-screen work-area resize GUI: don't crash / hang on certain environments if accessibility support is enabled GUI: fixed various issues in Unscaled HiDPI Output mode (bug #15707) GUI: extend the VM Input menu with Print Screen-related actions GUI: improved handling of inserting the Guest Additions ISO image by trying all available optical drives rather than only the first one and by not asking the user if he wants to force unmounting (which doesn't work in most cases anyway) API: default to RTC using UTC for Solaris 11 guests Settings: be less restrictive when reading a VM configuration containing a host-only adapter without an interface name Storage: fixed resizing VDI images resulting in an unbootable image under certain circumstances (bug #15983) NAT: fixed several 5.1.8 regressions on Mac OS X and Windows hosts (bug #16084) Audio: fixed a few 5.1.x regressions by using the audio code from 5.0.x until the audio overhaul is completed VBoxManage: fixed documentation of the storagectl command (bug #15971) Build system: another fix for building VirtualBox on systems which default to Python 3 Windows hosts: hardening fix for Windows 10 build 14971 (bug #16202) Windows Additions: properly start the VirtualBox guest services even if the guest user name contains special characters (bug #15982) Solaris Additions: fixed preemptible mouse notification callback being executed under a spinlock for Solaris guests Linux hosts / guests: Linux 4.9 fixes (bugs #16155 and #16064)
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