VirtualBox是一款免费且开源的虚拟化软件，允许用户在他们的计算机上创建和运行虚拟机。使用VirtualBox，用户可以在他们的计算机上同时安装和运行多个操作系统，而无需创建单独的分区或购买额外的硬件。

VirtualBox的主要优点之一是易于使用。即使是对虚拟化技术几乎没有经验的人，它也很容易安装和设置。VirtualBox还提供了广泛的自定义选项，包括调整分配给每个虚拟机的RAM、CPU核心和硬盘空间的能力。

VirtualBox的另一个重要特点是其与多种操作系统的兼容性。用户可以在他们的虚拟机上安装和运行Windows、Linux、macOS及许多其他操作系统。这使得它成为一个对开发人员、软件测试人员以及任何需要在单台计算机上运行多个操作系统的人来说非常优秀的工具。

VirtualBox 还提供了一系列高级功能，例如对 USB 设备、共享文件夹和网络适配器的支持。这些功能使得运行需要硬件或网络资源的软件成为可能，例如虚拟路由器、防火墙和服务器。

VirtualBox 是任何需要在一台计算机上运行多个操作系统的人的绝佳选择。其易用性、广泛的自定义选项以及与许多不同操作系统的兼容性，使其成为开发人员、IT 专业人员和家庭用户的多功能而强大的工具。

关键功能：

• 跨平台兼容性。
• 直观的图形用户界面。
• 支持各种操作系统。
• 与主机操作系统的无缝集成。
• 快照和克隆。
• 网络功能。
• 虚拟设备支持。
• 扩展包用于增加功能。

• VMM: fixed an occasional Guru Meditation (Mac OS X hosts only)
• VMM: fixed a rare condition that would fail to invalidate guest TLB entries or would invalidate them when not required (Windows hosts only)
• VMM: fixed a VERR_NOT_SUPPORTED Guru Meditation seen with certain guests, e.g. OpenServer 5.0.7
• VMM: more fixes for MSR emulation on certain hardware
• GUI: fixed mouse positioning with mouse integration disabled and multiple guest screens (Windows hosts only)
• GUI: fixed crash in VM manager
• GUI: fixed crash under rare conditions on entering/exiting fullscreen/seamless mode
• Shared Clipboard: don't stop working after taking a snapshot
• AHCI: fixed a crash under rare circumstances
• API: fixed a hang during VM shutdown under rare conditions
• NAT: fixed generation of malformed ICMP error datagrams (4.3.10 regression)
• NAT: fixed potential crash in DNS proxy
• NAT Network: don't drop port forwarding rules after some time
• NAT: fixed ARP cache corruption and network loss in Windows guest caused by iSCSI service activity
• USB: improved check if a storage device is currently mounted to the host when the device is about to be attached to the VM (Mac OS X hosts only)
• 3D support: several fixes, including better support for Ubuntu 14.04
• VRDP: fixed a potential crash on client disconnect
• VBoxSVC: fixed a race when a new client is started a few seconds after the last client terminated (Windows hosts only)
• VBoxSVC: fixed VirtualBox.xml registry corruption after VM renaming
• VBoxSVC: fixed a potential crash caused by incorrect USB device filter (Mac OS X hosts only)
• Windows hosts: partly support 32-bit COM on 64-bit systems
• Windows host installer: implemented merge module (msm) support
• Linux hosts: fixed dependency of boot script on older Debian systems
• Linux guests: fix symbolic link to shared folder helper
• Linux Additions: don't crash VBoxService during guest execute for users without a password
• Linux Additions: fixed a bug in guest execution where the guest process terminated with VERR_INTERRUPTED to the host