Upgrading a Windows 95 postoffice to a full Microsoft Mail Server postoffice with the Microsoft Mail Post Office Upgrade product allows clients running MS-DOS, Windows, Windows for Workgroups, Windows 95, Windows NT, Macintosh, and OS/2 to exchange mail.
However, before Macintosh clients can use the Microsoft Mail Server, you need a file server capable of sharing files for both Intel-compatible computers and Macintosh computers. Windows 95 File and Print Sharing services do not work with Macintosh computers. Therefore, you need to install the Microsoft Mail Server on a Windows NT or a Novell® NetWare® server.