Microsoft Update
Microsoft Update is a website where users can download updates for various Microsoft Windows-related products. Updates from Microsoft Update can include those for Windows itself, Office, SQL Server, and sometimes hardware drivers as well. These updates are primarily security and bug-related fixes, although they occasionally contain new features.
The service is version 6 of Windows Update. Microsoft Update differs from Windows Update in that previously Windows Update only delivered updates for Windows itself, software drivers, and adjunct software such as Windows Media Player and NetMeeting. As of July 2006, Windows Update is the default update service for users of Windows XP and older operating systems, with Microsoft Update being an optional upgrade.