Outlook 2010 wont automatically update mailbox with new mail

Hi guys,

I have an Outlook 2010 client that has 5 additional shared mailboxes configured in her Outlook as well as her own making six in total.

If I remove one shared mailbox so there are only 5 in total, the emails auto download. Otherwise I have to click the 'update folder' button on the Send/Receive ribbon.

I tried googling to find if this expected behaviour but couldn't find any reference to it.

Other than keeping the mailbox count below 6, does anyone have any solutions to this or know what might be causing it?

Outlook 2010 on Windows 7 SP1 x64
Exchange 2010 on Server 2008 R2 x64
Steps taken.
I have done a scanpst on the OST file.
I have recreated the Exchange account in Control Panel > Mail and the new account does the same thing after the initial download of the mailbox too.

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JohnBusiness Consultant (Owner)Commented:
I assume all 6 accounts are Exchange. Try the following:

1. Delete the mail profiles in Control Panel, Mail.
2. Delete the OST files (they will rebuild).

Restart the computer, Remake the mail profiles in Control Panel, Mail, and then connect and allow the OST files to rebuild.

With 6 accounts, it will take some time to complete.
Will SzymkowskiSenior Solution ArchitectCommented:
I would try Outlook in Online mode first. If online mode works then it is a caching issue on the client. Outlook should not operate this way based on 5 shared mailboxes.

defectaAuthor Commented:
Thanks guys,

John, I have already done a variation of what you suggested. The difference being that I created a new profile via Control Panel > Mail without deleting the old one, nor restarting the computer. But the new profile did the same thing after 24 hours. Which makes me think its something more central to Outlook. But I will try as you suggested and report back.

Will, Outlook is in online mode and was so by default. Thanks for confirming that this isn't normal behaviour.
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defectaAuthor Commented:
So doing exactly as you suggested John didn't help I'm afraid.

What I have done is remove one of the shared mailboxes and granted the user access to it via MailStore, our mail archiving solution, as that is a suitable workaround. And as soon I did so, the mail started flowing again. =/

Of note, after deleting the OSTs and Mail profiles this morning and letting the new profile and OST download, the user reported that a whole bunch of mail from this morning disappeared from her inbox suddenly. We could see the mail in her inbox still via OWA but it was no longer there in Outlook. I had her press the Update folder on the Send/Receive tab of the toolbar while I watched and it brought it back. Very strange behaviour.

I tried removing 1 shared mailbox at a time in case it was 1 specific mailbox that was causing the issue but I was unable to isolate the issue to any 1 mailbox. This let me to discover that it was only once the number of shared mailboxes was less than 6 that mail would again begin to flow.

So I have found a suitable workaround for this issue but we still don't have a reason why I am seeing this unexpected behaviour. =/
JohnBusiness Consultant (Owner)Commented:
Based on your description, try all this in a new, test, Windows User Profile (Account). Set up the new user account, log in, set up Outlook and test. It could be a damaged Windows User account.
defectaAuthor Commented:
Further testing seems to have isolated the issue to one of the mailboxes.

If I remove all shared mailboxes but this one suspect mailbox, lets call it user B for the sake of  this conversation, so there is just user A's mailbox and the suspect user B's mailbox open in Outlook, new mail will not auto download.

If I remove the full access permissions for user A from user B's mailbox on Exchange, then restart Outlook on user A's workstation, mail starts to download automatically.

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defectaAuthor Commented:
Thanks for your suggestions guys. John I tried your most recent suggestion too, to no avail.

I actually think this is a combination of problems but removing permissions for user A to access user B's mailbox has done the trick for now.

User A's mailbox is shared with another user, user C and User C can see a long list of emails in user A's outbox. Emails that don't exist when user A checks their outbox. The emails in the outbox appear to be records of emails that have successfully sent but for some reason, are still showing in the outbox to other users.

Yet another problem to be worried about. =/
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