Just a heads up in case anyone else runs into this. We recently upgraded to Zimbra 7 NE. One of my users has an LG Ally, which suddenly stopped syncing (contacts, calendar, and e-mail). It also asked you to accept giving the mail provider access to remotely wipe the phone. Accepting makes no difference.
Easy fix is to disable mobile policy under the users account under admin.
Just figured I'd share the solution in case anyone else runs into this.