Outlook not displaying all imap emails

Hi

A client of mine is experiencing a strange phenomenon in Outlook 2013 32bit

Yesterday he was sorting his emails and moved a few into sub (/sub/sub/...) folders

This morning he tried to access one of these emails, in it's present sub folder, and just as Outlook had finished displaying the contents of this folder, the sought email disappeared before his very eyes ! This isn't the first time he experiences such a behaviour by Outlook

I connected up to his account from my PC using Thunderbird and when I view the contents of the folder mentioned above I see its contents, missing email included

We checked other folders and realized that Outlook, compared with Thunderbird, isn't displaying the entire contents of these folders

I tried to check whether there were any filters enabled in the View menu but couldn't find any (maybe this is configured elsewhere ?)

I copied the missing email to his Inbox and asked him to transfer it back to the desired sub folder again : and now he sees it in its new destination (I however see two copies of it under Thunderbird)

Incidentally the Synchronization error folder contains over fifty thousand errors; should we heed the high quantity of these errors or ignore them ?

Any ideas on what could be causing this Outlook issue ?

Two weeks ago I split his OST file, by archiving part of it to a PST, because the file had reached 28 GB
The created archive is 10 GB in size, while the OST file has now shrunk to 5 GB. I can't explain what happened to the missing difference (13 GB)

thanks
yann

PS
Why does the Office setup install Office in 32bit mode by default (on 64bit systems) ?
Yann ShukorOwnerAsked:
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Davis McCarnOwnerCommented:
Yes but you also have multiple Outlook data files and Outlook can be peculiar about what it shows you so you need to inspect the corresponding folder in each data file.
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Davis McCarnOwnerCommented:
PS  Most (the vast majority) of Office 2007, 2010, and 2013 are using the 32 bit version and you would have a whole different set of bugs if you forced the installation of the 64 bit version.  Its also easier for MS to virtualize and subsequently protect 32 bit software.
Do you have web access to the email?  If you do, check it that way and see what you get.
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Yann ShukorOwnerAuthor Commented:
Thanks for your response Davis

Unfortunately the Webmail interface doesn't display all the sub folders (when there are too many)
Not only do I trust what Thunderbird is showing me but I also contacted the ISP which confirmed the presence of the 'hidden' emails
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Davis McCarnOwnerCommented:
Then something is gescrewdefay in the guys Outlook.  If you are comfortable with the process, add a new, duplicate email account using IMAP and using a different Outlook file.  It will probably take a long, long time to sync; but, see what you get with it.
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Yann ShukorOwnerAuthor Commented:
That's what we I did when we archived part of his emails
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Davis McCarnOwnerCommented:
Have you checked the folders in the Archive to see if the emails are there?
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Yann ShukorOwnerAuthor Commented:
Like I said, when her account is accessed via Thunderbird, I can see all her emails, exactly where they are supposed to be
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Yann ShukorOwnerAuthor Commented:
not fixed
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