Microsoft bought QDOS rights from Seattle Computer Products(SCP) for $25,000 on 27th, 1981.
| Year | Month | DOS Family Release | Description |
|---|---|---|---|
| 1981 | April, 11 | PC-DOS 1.0 | --- |
| 1982 | August | MS-DOS 1.25 | --- |
| 1983 | March | MS-DOS 2.0 | --- |
| 1984 | September | MS-DOS 3.0 | Microsoft introduces MS-DOS 3.0 for the IBM PC AT.It supports for larger hard disk drives. |
| 1984 | November | MS-DOS 3.1 (Network) | It supports for Microsoft Networks. |
| 1986 | April | MS-DOS 3.2 | --- |
| 1987 | April | MS-DOS 3.3 | --- |
| 1988 | July | MS-DOS 4.0 | --- |
| 1988 | Nov | MS-DOS 4.01 | --- |
| 1991 | June | MS-DOS 5.0 | It includes a full-screen editor. A number of bugs required reissue. |
| 1993 | August | MS-DOS 6.0 | Online help through QBASIC. Disk compression and antivirus included. |
| 1993 | November | MS-DOS 6.2 | --- |
| 1994 | March | MS-DOS 6.21 | --- |
| 1994 | April | MS-DOS 6.22 | New DRVSPACE compression. |
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