Microsoft exchange servers are really good, so to get more
information about that product, you should try going to the
Microsoft website and looking on there.
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Yes, Microsoft business servers are reliable. I've been using
Microsoft products for a long time and I've never had a problem
with them. For more information on Microsoft business servers,
visit their website: www.microsoft.com/wess/
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There are several companies or firms that sell anti spam
software for Microsoft Exchange servers. A few examples would
include Microsoft, Symantec, ESET and GFI.