微软公司到现在一共出了多少个版本的操作系统？

给大家见识一下WINDOWS的发展历史~
MS-DOS 6.2 ( 3 floppy images - IMA for WinImage )
MS-DOS 6.22 ( 3 floppy images - IMA for WinImage )
Windows 3.1 ( 6 floppy images - IMA for WinImage ) ( 3.10.103.0 )
Windows 3.11 for Workgroups ( 8 floppy images - IMA for WinImage ) ( 3.11.300.0 )
Windows 95 ( Upgrade Version ) ( 4.0.950.0 )
Windows 95 ( Version "b" ) ( 4.0.1086.0 )
Windows NT 4 Workstation ( 4.0.1375.1 )
Windows NT 4 Server ( 4.0.1375.1 )
Windows NT 4 Terminal Server ( 4.0.1375.1 )
Windows NT 4 Server, Enterprise Edition + SP3 ( 4.0.1381.4 )
Windows NT 4 3in1 + All Service Packs CD ( Version 1 - Will not boot properly... yet. see me for Version 2 )
Windows 98 ( 4.10.1998.0 )
Windows 98 Second Edition ( 4.10.2222.0 )
Windows 2000 Professional ( 5.0.2195.0 )
Windows 2000 Professional ( Integrated Service Pack 1 + SP1 upgrade executable )
Windows 2000 Professional ( Integrated Service Pack 2