We are receiving excessive Local Failure Delivery error messages. This started since our initial migration to Zimbra from Exchange 2 weeks ago. Its an initial sync error, and users are also having problems with their Outlook tasks/calendars automatically syncing correctly. Many times, changes are made to calendar items and it doesn't show up for other users.

Often these error e-mails appear right after a pop up dialog warning that a particular task/calendar event will not be displayed because it is not in my calendar. It then asks if this is okay. When No is clicked, a local delivery error is genreated.

We have enabled logging. Below are some details. Please advise.

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

Sync Type: Delta Sync

Sync Token (before request): 6414

Sync Token (most current): 7347

Store: Zimbra - B********** ****

Computer Name: VM-ALEX

Version: 5.0.2817.11

Error IDs:
id (5480) type(task) message([Subject: TO DO LIST]
[Details: COM Exception HRESULT: -2147352567. ])




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

Sync Type: Delta Sync

Sync Token (before request): 26823

Sync Token (most current): 26825

Store: Zimbra - Er** ********
Computer Name: MLF-*******

Version: 5.0.2817.11

Error IDs:
id (38705) type(appointment) message(failed to synchronize this item) id (38748) type(appointment) message(failed to synchronize this item)