MS-DOS 3.0 debuted with the IBM PC/AT (as PC-DOS 3.0) and adds support for 5.25-inch, 1.2 MB floppy disks, support for the AT's internal clock and officially supports partition sizes up to 32MB, with sizes this large only being available from certain OEMs in prior versions of DOS. While MS-DOS 3.0 was planned to ship with networking support, it was cut prior to release due to bugs.
| Microsoft Operating System Versions |
| Microsoft Operating System Versions:
MS-DOS: QDOS | 1.0 | 2.0 | 2.1 | 2.11 | 3.0 | 3.1 | 3.2 | 3.21 | 3.3 | 3.3A | 3.31 | 4.0 | 4.01 | 4.01A | 5.0 | 5.0A | 6.0 | 6.2 | 6.21 | 6.22 | 7.0 | 7.1 | 8.0 Windows 1.x: 1.0 | 1.01 | 1.02 | 1.03 | 1.04 Windows 2.x: 2.0 | 2.01 | 2.1 | 2.2 Windows 3.x: 3.0 | 3.0A | 3.1 | 3.11 | 3.2 Windows for Workgroups 3.x: 3.1 | 3.11 Windows 9x: 95 | 98 | ME Windows NT: 3.1 | 3.5 | 3.51 | 4.0 | 2000 | XP | 2003 Windows NT: Vista | Longhorn Server | Blackcomb Server Windows NT: Windows 8 | Windows 10 | Windows 11 Windows CE: 1.0 | 1.1 | 2.0 | 2.1 | 2.11 | 2.12 | 3.0 | 4.0 | 4.1 | 4.2 | 5.0 Windows Embedded: NT | XP Windows Mobile: 2003 | 5.0 Previous Windows Codenames: Janus | Snowball | Kato | Daytona | Chicago | Memphis | Millennium | Cairo | Odyssey | Neptune | Whistler | Longhorn | Blackcomb |