| Year | Event |
| 1981 | Microsoft buys the rights for QDOS from Seattle Computer Products (SCP) for $25,000 on July 27, 1981. |
| 1981 | MS-DOS 1.0 was released August, 1981. |
| 1982 | MS-DOS 1.25 was released August, 1982. |
| 1983 | MS-DOS 2.0 was released March, 1983. |
| 1984 | Microsoft introduces MS-DOS 3.0 for the IBM PC AT and MS-DOS 3.1 for networks. |
| 1986 | MS-DOS 3.2 was released April, 1986. |
| 1987 | MS-DOS 3.3 was released April, 1987. |
| 1988 | MS-DOS 4.0 was released July, 1988. |
| 1988 | MS-DOS 4.01 was released November, 1988. |
| 1991 | MS-DOS 5.0 was released June, 1991. |
| 1993 | MS-DOS 6.0 was released August, 1993. |
| 1993 | MS-DOS 6.2 was released November, 1993 |
| 1994 | MS-DOS 6.21 was released March, 1994 |
| 1994 | MS-DOS 6.22 was released April, 1994 |
Thursday, December 15, 2011
Microsoft DOS History
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