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VirtualBox 5.1.16 Build 113841| FreeWare | 117 MB
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 conﬁgure 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 conﬁgurations. 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 signiﬁcantly 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.
VMM: don’t access the MSR_IA32_SMM_MONITOR_CTL MSR if dual-monitor treatment is not available (KVM workaround, bug #14965)
VMM: another fix for handling certain MSRs on ancient CPUs without VT-x support for MSR bitmaps
VMM: fixed VERR_SSM_LOAD_CPUID_MISMATCH errors when restoring a saved state with SMP guests on hosts without the CPUID/HTT bit set (bug #16428)
VMM: fixed a bug in call gate emulation
VMM: FWAIT instruction fix
VMM: fixed a sporadic guest hang under certain conditions
GUI: hide the mini-toolbar the taskbar and the pager on certain X11 hosts
GUI: better error handling on the global settings / network / host-only / DHCP server settings
GUI: fixes for full-screen with multiple screens
Host-only Network: fixed host-only adapter creation issue preventing VirtualBox installation on Windows 10 hosts (bug #16379)
NAT network: fixed two potential crashes in the DHCP server
ICH9: fixed incorrect initialization of the primary bus for PCI bridges (5.1.14 regression)
Storage: LsiLogic fix for Windows 10
USB: fixed not being able to attach certain USB devices having invalid characters in the device strings (5.0.18 regression; bug #15956)
USB: several fixes for the USB/IP support (bug #16462)
VBoxSVC: fixed another crash during shutdown under rare circumstances
VBoxSVC: fixed a stack overflow on (Windows debug builds only; bug #16409)
OVF: when importing an appliance handle more than 10 network adapters if the OVA was created by VirtualBox (bug #16401)
OVF: fixes for exporting and importing appliances with many disks (bug #16402)
VBoxManage: fixed regression with modifyhd –resize (bug #16311)
rdesktop-vrdp: source code tarball fixes
Linux Installers: do not rebuild kernel modules unnecessarily (bug #16408)
Linux hosts: added an action for opening the VM manager window to the .desktop file
Linux hosts / guests: Linux 4.11 compile fixes (bug #16506)
Linux Additions: added vboxsf FS modules alias (bug #16404)
Linux Additions: fix for the shared folders kernel module to compile on Linux 4.10
Linux Additions: properly install the Linux kernel module override rule on distributions without /etc/depmod.d
Windows Additions: fixed a crash with recent Windows 10 builds if 3D is disabled (bug #15973)
Home Page – https://www.virtualbox.org