The Major BBS (sometimes MajorBBS or MBBS) was bulletin board software (a bulletin board system server) developed between 1986 and 1999 by Galacticomm. In 1995 it was renamed Worldgroup Server and bundled with a user client interface program named Worldgroup Manager for Microsoft Windows. Originally DOS-based, two of the versions were also available as a Unix-based edition, and the last versions were also available for Windows NT-based servers.