From the 'Window' menu, select 'Sync Status' to monitor the process.Your local copy of your Inbox will be deleted, a fresh download of all e-mails will be performed.On the 'General' tab you will find a button named 'Empty Cache', click it.From the pop up, select 'Properties.' near the bottom.Right click (or Control click) the Inbox of the account having the problem.Connect to your fastest network connection, you may be downloading gigabytes of data.This isn't very efficient because rebuilding the cache requires a full download of your Exchange account, if you could delete the cached version of the affected e-mail it would be more efficient.įollow the steps below to clear the cache of the affected folder: All but once has rebuilding the cache fixed the issue, the one time itĭidn't work I used OWA to download the attachment but it turned out to be corrupt. I know this may be required when an error pops up with code -17890 on the Sync Errors page. I've had this happen a few times, I have had luck deleting the cache of the affected Inbox. I am currently using Microsoft Outlook for Mac, version 15.40 (171108).
