IMAP emails size is 0KB

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Outlook version
Outlook 2013 32 bit
Email Account
Exchange Server

First time posting here so hopefully I don't break any rules :)

Bit of background details. We're using Outlook 2013 with Exchange hosted by Microsoft as our primary email. We also have IMAP shared folders (though this will be migrated to exchange/sharepoint sometime in the future).

We've got an issue where outlook displays the size of emails in an IMAP account as 0KB. From what I've gathered it only affects emails which have been moved from exchange to IMAP.

I've moved the message back to Exchange and it displays the correct size, same if it's moved to a pst file.
I've fiddled the registry to increase the maximum attachment size to unlimited on my machine and no change. (so this fix: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Preferences,Then add a new DWORD value: MaximumAttachmentSize)
I've set the root folder to be "Inbox" but this didn't end well for me (crashed outlook twice and still didn't fix the problem).

What does work is to remove the IMAP ost file and let it recreate but this isn't really a feasible option as many of the users have ost files in excess of 30GB and some of the IMAP shares reside on geographically different servers (and considering the low line speeds this might take days to recreate).

Does anyone have any words of wisdom that might help :)

Outlook version
Outlook 2013 32 bit
Email Account
Exchange Server
Hi Diane

Thanks for getting back to me so quickly. Nothing in my sync issues (though I'll check out some other users before jumping to conclusions) and the messages have definitely synced up because I've checked with others and they can see the message there (along with the size). I've seen a few of your posts and I'm thinking that maybe outlook isn't thinking that it has synced properly even though it has because it's only on the pc/user account where the email was moved.

Thanks :)
Outlook version
Outlook 2013 32 bit
Email Account
Exchange Server

Just changed to folder view and found another sync issues folder. This sums up the majority of what is in there

17:11:49 Synchronizer Version 15.0.4613.1000
17:11:49 Synchronizing Mailbox '' (i've removed my email address from here)
17:11:49 Synchronizing Hierarchy
17:11:49 Error synchronizing folder
17:11:49 [800CCCD2-0-0-720]
17:11:49 Terminated in error
17:11:49 [800CCCD2-0-0-720]

The user I have been dealing with is getting mostly
11:46:21 Error synchronizing folder
11:46:21 [8004DF03-0-0-560]
I have a handful of those in my sync issues as well.

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