The Major BBS (sometimes MajorBBS or MBBS) was a
bulletin board system
A bulletin board system (BBS), also called a computer bulletin board service (CBBS), is a computer server running list of BBS software, software that allows users to connect to the system using a terminal program. Once logged in, the user perfor ...
server.
A review in PCMag described it as easy to install but difficult to configure. Its users included the U.S. Department of Commerce.
A game called MajorMUD could be played on MajorBBS servers.
References
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Bulletin board system software
DOS software
Proprietary software
Windows file sharing software