On the negative side, MAPI is Microsoft's protocol. It is documented (though not well), and Microsoft remains committed to using it, not only for Outlook but also for the e-mail hooks other Office applications use. Of course, that doesn't mean Microsoft won't pull the rug out from under MAPI or change it enough so that existing products no longer
function as intended. However, because MAPI is embedded in so many Microsoft and third-party applications, this scenario is unlikely, but forewarned is forearmed.
Just the Two of Them
We tested two contestants: Stalker Software's CommuniGate Pro (CGPro) mail server and SuSE Linux's Openexchange Server (SLOX). Because SLOX doesn't yet have a MAPI connector, it lacks several crucial capabilities. For this reason, we tested both products but did not rank the pair against each other. SLOX may be missing a MAPI connector, but it does have Outlook replication technology that works well.