对于VMWare、Virtual PC这些虚拟机软件，可能大家都比较熟悉。VirtualBox是德国一家软件公司InnoTek所开发的虚拟系统软件，它不仅具有丰富的特色，而且性能 也很优异。更是开源的，成为了一个发布在GPL许可之下的自由软件。VirtualBox 可以在 Linux 和 Windows 主机中运行，并支持在其中安装 Windows (NT 4.0、2000、XP、Server 2003、Vista)、DOS/Windows 3.x、Linux (2.4 和 2.6)、OpenBSD 等系列的客户操作系统。假如你曾经有用过虚拟机软件的经历的话，相信使用 VirtualBox 不在话下。即便你是一个新手，也没有关系。VirtualBox 提供了详细的文档，可以助你在短期内入门。
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VirtualBox 2.1.4 (released 2009-02-16)
This is a maintenance release. The following items were fixed and/or added:
- Windows hosts: fixed host crashes/hangs on certain 32 bits Windows systems when running Linux guests (bugs , , )
- Windows hosts: Fixed network component BSOD issue (bugs , )
- Windows hosts: Fixed installation issues (bugs , , )
- Linux hosts: fixed occasional kernel oopses (bug )
- Linux hosts: fixed module dependency for shipped modules (bug )
- Linux hosts: moved the udev rules for USB forward so that they don’t override existing system rules (bug )
- Linux hosts: fixed the issue with guest not being able to communicate with each other when attached via TAP interfaces (bug )
- Linux hosts: give up probing for USB gracefully if dbus or hal are not available (bug )
- Linux hosts: fixed warnings in installer when SELinux was disabled (bug )
- Linux hosts: VirtualBox sometimes failed to start if it had been started using sudo previously (bug )
- Solaris hosts: fixed high CPU load while running many guests in parallel
- Solaris hosts: fixed inability to start more than 128 VMs
- VMM: fixed performance regression for Windows guests (bug )
- VMM: ignore CPU stepping when restoring a saved state/snapshot
- REM: fixed inability to use gdb to debug programs in Linux guests with software virtualization (bug )
- GUI: fixed dead key handling on Solaris hosts (bug )
- GUI: in the shutdown dialog, disable the action send the shutdown signal if the guest is currently not using ACPI
- GUI: suppress additional key release events sent by X11 hosts when keys are auto-repeated (bug )
- API: restore case insensitive OS type name lookup (bug )
- VBoxHeadless: really don’t start X11 services (clipboard service, 3D acceleration; Solaris & Darwin hosts only; bug )
- NAT: fixed occasional crashes when the guest is doing traceroute (non-Windows hosts; bug )
- NAT: fixed crashes under high load (bug )
- NAT: fixed truncated downloads (Windows hosts only, bug )
- NAT: don’t intercept TFTP packages with a destination address different from the builtin TFTP server (bug )
- USB: several fixes for USB passthrough on Linux hosts
- USB: reduced host CPU utilization if EHCI is active
- VRDP: fixed VRDP server black screen after a client reconnect (bug )
- VRDP: modified rdesktop client (rdesktop-vrdp) now uses NumLock state synchronization (bug )
- LsiLogic: make FreeBSD guests work (bug )
- ATA: fixed deadlock when pausing VM due to problems with the virtual disk (e.g. disk full, iSCSI target unavailable)
- iSCSI: fixed possible crash when pausing the VM
- 3D support: added missing GL_MAX_TEXTURE_COORDS_ARB (bug )
- Windows Additions: fixed ERROR (e0000101) error during installation (bug )
- Windows Additions: fixed Windows Explorer hang when browsing shared folders with 64 bit guests (bug )
- Windows Additions: fixed guest screen distortions during a video mode change
- Windows Additions: fixed the Network drive not connected message for mapped shared folders drives after the guest startup (bug )
- Linux Additions: fixed occasional file corruption when writing files in O_APPEND mode to a shared folder (bug )
- Linux Additions: the mouse driver was not properly set up on X.Org release candidates (bug )
- Linux Additions: fixed installer to work with openSUSE 11.1 (bug )
- Linux Additions: disable dynamic resizing if the X server is configured for fixed resolutions
- Linux/Solaris Additions: handle virtual resolutions properly which are larger than the actual guest resolution (bug )
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