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What do Synchronization Log error messages mean in Outlook?

Sometimes you may receive an email, apparently from yourself, with the Subject line "Synchronization Log:" and the content may look something like this:

15:46:16 Synchronizer Version 14.0.6131
15:46:16 Synchronizing Mailbox 'Ann Other'
15:46:16 Synchronizing local changes in folder 'Deleted Items'
15:46:16 Uploading to server ''
15:46:16 Synchronization of some deletions failed.
15:46:16                 [0-130]
15:46:16           1 item(s) deleted in online folder
15:46:16 Done

Your name (or the name of the mailbox) would be shown where we have used 'Ann Other' as an example here.  The time shown on the left of the lines in the message indicate the time the sychronizer log entry was made, and will probably match the time the message was sent to you.

This is probably happening if you're using Outlook in Cached Exchange Mode and there is a problem with the caching file on your computer.  You may also receive apparently false 'mailbox full' warnings.

The simplest solution is to switch off Cached Exchange Mode.  To do this, follow the instructions in FAQ 2348.

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This is question number 2561, which appears in the following categories:

Created by Andy Clews on 4 April 2013 and last updated by Richard Byrom-Colburn on 20 October 2016