POP3 and IMAP4 clients cannot connect to a server that is running Exchange Server 2007
I've been seeing some questions about IMAP and POP3 authentication on Exchange Server 2007. So.. Microsoft has released to fix it, here is the link:
http://support.microsoft.com/default.aspx?scid=kb;en-us;937359&sd=rss&spid=10926
Ps.: Log on using other account through POP or IMAP is not supported.
Technorati : Exchange 2007, IMAP4, POP3, cannot connect
Del.icio.us : Exchange 2007, IMAP4, POP3, cannot connect