I am also facing an issue after first initializing sync: It start to claim that server cannot be committed. Red arrow appears and until account is reinitialized nothing happens. Exchange server is 2010 with latest patches.

There was one intresting thing however: When activating developer mode in order to save logs, after boot MfE worked like a charm for over 30 minutes. Unfortunately it stopped to same red arrow afterwards.

Bug or setting?

-nibbe-