Microsoft Mail (or MSMail) was the name given to several early Microsoft e-mail products.
One of the largest such switches was operated by Royal Dutch Shell as recently as 1994, permitting the exchange of messages between a number of IBM Officevision, Digital Equipment Corporation ALL-IN-1 and Microsoft Mail systems.
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MHS was a very 'open' system, and this, with Novell's encouragement, made it popular in the early 1990s as a 'glue' between not only the proprietary email systems of the day such as PROFS, SNADS, MCI, 3+Mail, cc:Mail, Para-Mail and Microsoft Mail, but also the competing standards-based SMTP and X.400.
It was originally intended as a companion to Microsoft Mail, but later it was a companion to Microsoft Exchange and was part of Microsoft Office 95, and later Microsoft Exchange Client and Windows Messaging, so it was later included and developed as part of Microsoft Exchange Server, which resulted in version 7.5 of Schedule+ as part of Exchange Server 5.0.