It's basically an ease of use thing, I've tried out various IMAP/LDAP client/server combinations but non of them are as easy as for the user as Exchange/Outlook are. There are also things like calendering and forums built in and delivery and read receipts that are easy to use. I also need to have an e-mail system that can talk to X400 systems easily - granted not a universal requirement - and Exchange copes with X400 and SMTP/ESMTP well (plus others like MS Mail, ccMail etc.)
While I prefer Unix/Linux for most server tasks as they are great OS's, I prefer Exchange as an e-mail platform.
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It's basically an ease of use thing, I've tried out various IMAP/LDAP client/server combinations but non of them are as easy as for the user as Exchange/Outlook are. There are also things like calendering and forums built in and delivery and read receipts that are easy to use. I also need to have an e-mail system that can talk to X400 systems easily - granted not a universal requirement - and Exchange copes with X400 and SMTP/ESMTP well (plus others like MS Mail, ccMail etc.)
While I prefer Unix/Linux for most server tasks as they are great OS's, I prefer Exchange as an e-mail platform.