Windows 7.
There are two types of Windows PC operating systems--Windows and Windows Server. The latest version of Windows Server now is Windows Server 2008 R2. The latest version of Windows (non-server) now is Windows 7.
Windows 7 is the latest Windows Operating System
If by Microsoft you mean the Windows operating system: The latest general OS is Vista (6.0.6002) The latest server OS is Windows Server 2008 (6.0.6002) The latest (release candidate) for Vista's successor is Windows 7 (6.1.7100)
Windows Server 2003 Service Pack 2 (32-bit x86)Supported Operating Systems: Windows Server 2003; Windows Server 2003 R2 (32-Bit x86); Windows Server 2003 Service Pack 1; Windows Small Business Server 2003 Note: Nowadays Latest service pack 2 windows server 2003.
Latest by this date is WAMP SERVER 2.1a
The latest version of Windows Movie Maker is v2.6 (for Vista).
My Windows 7 laptop has Version 5.5.0.124 - if that's any use !
Windows Server 2008 is the most recent release of Microsoft Windows' server line of operating systems. Released to manufacturing on 4 February 2008 and officially released on 27 February 2008, it is the successor to Windows Server 2003, released nearly five years earlier. Like Windows Vista, Windows Server 2008 is built on the Windows NT 6.0 kernel. A second release, named Windows Server 2008 R2, is currently under development.
Windows 8
The last version of Windows under the "NT" brand was Windows NT 4. The latest version to be built upon Windows NT is Windows Vista (Windows 7 has not yet been releasedofficially).
The latest version of Windows XP is Service Pack 4.
The Microsoft Virtual Sever deals with creating virtual machines for several Windows operating systems. The Virtual Server 2005 R2 SP1 is the latest version.