VirtualBox最早是德國一家軟體公司InnoTek所開發的虛擬系統軟體,後來被Sun收購,改名為Sun VirtualBox,在Sun被Oracle收購后現改名為Oracle VirtualBox.因為他是開源的,不同於VM,而且功能強大,可以在 Linux/Mac 和 Windows 主機中運行, 並 支持在其中安裝 Windows (NT 4.0、2000、XP、Server 2003、Vista)、DOS/Windows 3.x、Linux (2.4 和 2.6)、OpenBSD 等系列的客戶操作系統.假如你曾經有用過虛擬機軟體的經歷的話，相信使用 VirtualBox 不在話下。即便你是一個新手，也沒有關係。VirtualBox 提供了詳細的文檔，可以助你在短期內入門。
下載:VirtualBox 4.0.2
VirtualBox 4.0.2 (released 2011-01-18)
This is a maintenance release. The following items were fixed and/or added:
GUI: don't crash if a removable host drive referenced from the VM settings vanished GUI: fixed a crash when using the KDE4 Oxygen theme and clicked on the settings button (4.0 regression; bug #7875) GUI: properly warn if the machine folder cannot be created (bug #8031) GUI: several fixes for multimonitor X11 guests ExtPack: don』t make the installer helper application suid root (Linux .deb/.rpm packages only) ExtPack: improved user experience on Vista / Windows 7 when installing an extension pack ExtPack: fixed issue with non-ascii characters in the path name during installing an extension pack (bug #7917) ExtPack: fixed SELinux issues on 32-bit Linux hosts VBoxManage: Host-only interface creation and removal is now supported for all platforms except Solaris (bug #7741) VBoxManage: fixed segmentation fault when removing non-existent host-only interface Storage: fixed possible crashes with VMDK/VHD images with snapshots and async I/O (4.0 regression) Storage: don』t eject the physical medium if a DVD/CDROM/floppy drive is detached from a VM (bug #5825) Storage: be more robust when a faulty guest sends ATA commands to an ATAPI device (bug #6597) Parallels: fixed deletion of the image during suspend, pause or power off (4.0 regression) Bridged networking: fixed host kernel panic when bridging to devices with no TX queue (4.0 regression; Linux hosts only; bug #7908) NAT: port-forwarding rule registration respects protocol parameter (bug #8094) E1000: fixed PXE boot issues with WDS (bug #6330) Virtio-net: fixed the issue with TX performance in some Linux guests ICH9: fixed VM crash (software virtualization only; bug #7885) VGA: fixed VESA screen issue (4.0 regression; bug #7986) Shared Folders: fixed parameter parsing when creating symbolic links, fixes 32-bit/64-bit bitness issue (bug #818) Main: fixed crash under rare circumstances due to an invalid logging string (4.0 regression) Main: improve error information propagation for errors preventing a VM start Main: fixed problems with snapshots and non-ASCII characters in machine paths (bug #8024) Webservice: now listens to localhost by default as documented (bug #6067) Settings: do not fail loading machine settings if removeable drive attachment (host drive or image) cannot be found; with 4.0 this is much more likely when machines are moved from one host to another Settings: fixed issue that changing a snapshot name or description was not saved to machine XML OVF/OVA: fixed import of files created by other OVF tools (bug #7983) rdesktop-vrdp: fix a crash during USB device enumeration (bug #7981) Linux hosts: fixed a crash during USB device enumeration. Linux hosts: try a bit harder to allocate memory (bug #8035; 4.0 regression) Guest Additions: fixed parsing of parameters for guest control in VBoxService (4.0 regression; bug #8010) Windows Guest Additions: automatic logon on Windows Vista/Windows 7 now supports unlocking previously locked workstations
