[BContario]

The problem seemed to be related to IMAP for us. Here is what we did:

- Enable the MS Exchange IMAP service (we had disabled it)

- In Exchange System Manager, under the server in Protocols, go into "IMAP4" properties, and in the Access tab click the Certifcate... button and add in the same certificate that is configured for the HTTPS website.

- Open port 993 (IMAP4 SSL) in our firewall to our Exchange server.

We don't know what combination of the 3 is the actual fix, but we know that WM6.1 Exchange email items were failing miserably to sync before, and now they are syncing again.