Windows Internet Explorer 9 (abbreviated as IE9) is the current version of the Internet Explorer web browser from Microsoft.
Adapted from the SO internet-explorer-9 tag wiki.
The system requirements for IE9 are Windows 7, Windows Server 2008 R2, Windows Vista Service Pack 2 or Windows Server 2008 SP2 with the Platform Update. Windows XP is not supported. Both 32-bit and 64-bit builds are available.