The server could run on OS/2, VM, MVS (XA or ESA), or OS/400, while the requester required OS/2 Extended Edition running on IBM PS/2 personal computers, or DOS.
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Oliver North believed he had deleted his correspondence, but the system archived it anyway.
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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.