Or were just upgrade versions released in a retail box? I can find plenty of OEM versions on eBay, and plenty of MS-DOS 6 and Windows 3.11 retail boxes, but I've only seen MS-DOS 6.22 and Windows for Workgroups 3.11 retail boxes for the upgrade versions.
EDIT: I just checked and the latest non-upgrade retail version of MS-DOS I could find was MS-DOS 5!
EDIT: I just checked and the latest non-upgrade retail version of MS-DOS I could find was MS-DOS 5!
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