I noticed an IMAP/Exchange option for new accounts, but it won't support my corporate Exchange. I'm currently running Outlook 2007 in the CrossOver windows emulator. It's extremely slow and won't accept emails needing authentication to open, since credentials never get passed in this OS environment. When do you plan on supporting?
On my mobile devices - both Android - I utilize Touchdown Exchange that works excellent, but they don't have a Mac desktop client.