However, Microsoft must still convert staunch Exchange 5.5 users. Mainstream support for Exchange 5.5 stops at the end of this year and all support ends at the end of 2005. "Our focus is still on 5.5 because as much as 40 percent of the installed base still use it as their primary messaging system," said Allister Frost, Microsoft product solutions marketing manager. "The plans for 5.5 were laid out a decade ago when many companies were buying their first fax machines - that's a long time ago."
Still 40%?  Maybe that explains the ongoing and renewed activity with IBM's Move2Lotus partners.  (Aside: Nice way to insult your installed base..."first fax machines?"  -- I thought that was like late 1980s.)
Some conflicting information about the Exchange roadmap...
Next year Microsoft will post a second service pack and extend Exchange with Edge Services, a message transfer service to block spam and viruses. The next major release, codenamed E12, remains several years away and will depend on the Longhorn next-generation operating system.
Other coverage from last week said that Edge Services might not ship in 2005.  But the more interesting bit there is that "E12" will depend on Longhorn...why pay for Software Assurance in the meantime?  The current Exchange architecture is just going to limp along until then.
Link: vnunet: Exchange faces fresh challenges > (via SearchDomino)

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