I updated the BES to Outlook 2007 and ZCB 5.0.10, and have one user getting a Local Failure Notice:

Local Failures were detected. No action is required.
This e-mail was generated for technical support purposes.

Sync Type: Delta Sync

Store: Zimbra - Jason M. Craddock

Computer Name: BES

Version: 5.0.2676.10

This object does not have an ID, it is a newly created item

Error Code: -2147221233
Error Message: Unknown error 0x8004010F

ErrorInfo::GetSource: Microsoft Office Outlook
ErrorInfo::GetDescription: The message you specified cannot be found.