A sync status 5 error typically indicates a server error. Reselecting the folder in Settings>Advanced>Choose Folders actually returns the sync key to 0, so if that does not work, chances are there is a corrupt item in the data. The best way to deal with a corrupt item in the data is to permanently delete the corrupted item. Finding which item is corrupted can be tricky, but the ones to look out for are emails and appointments with complex HTML encoding or with large attachments, or recurring events with huge recipient lists or with many exceptions.
In some cases, if you install TouchDown on a different device and it works or if the stock email application works but the sync status 5 error persists for TouchDown, then please note that Exchange stores the pairings of a mobile device to the server. Try logging into OWA and then using the MobileAdmin tool on the server and drop all pairings for the account. When you reinstall TouchDown it should create a new pairing on the server. After that, TouchDown should begin performing as expected once again.
Imported Document ID: TECH222522
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