I have a small AD Domain running on Win2008 R2. I have several e-Mail accounts with a Provider.
What I would like is to have a Mail Server in my Domain that picks up the mail from my Provider (POP3), stores them locally and makes them accessible to a domain user through IMAP (so that I can access it on multiple machines). Sending mail should go from my Client to my Server and them to the providers SMTP.
I'd like to integrate with my exising Active Directory users, so that my IMAP Usernames/Password are the same always as the AD User. Also, it should behave "friendly" towards the Windows Backup, so no "can't backup as files are in use"
Can Exchange 2010 do that? Or is there another Mail Server that does that? I don't need fancy stuff like public folders and the like.
It looks as if hMailServer (Official site / Wikipedia page) would serve your needs perfectly.
It uses a database to store its own configuration and mail index data. This could be backed up using the standard tools provided by your DB engine of choice.
Mail data, i.e. the actual email messages, is stored as raw MIME format, i.e. plain text and you should have no issues making backups of that.
It has AD integration so that your users don't need to remember yet another password.