Ok, this is blatant thievery from KB15871, but I've seen this a few times recently and figured it was worth noting.

Unfortunately, there isn't an automated way to do this from the BES ... The posted resolution is:

<content> To resolve this issue, delete and undelete the Desktop [SYNC] service book on the BlackBerry smartphone. Have each BlackBerry smartphone user complete the following steps:

1. Go to Options> Advanced Options> Service Book and highlight

...