Beyond beta still no support for Outlook 2010. Got a new PC with Win7Pro and Office 2010, installed DM5.1, pluged in my 8900, was recognised fine.
DM says something like "set up your sync preferences", I set up all like desired, but in the end of that the error message popped up "no message store available". Preferences were not saved and do sync takes place.
Already recreated profile, changed exchange cache mode, copied older mapi.dll into the dm-folder, no luck so far.
Frank