Outlook 2010 Stops Receiving Email

I have a user that has Outlook 2010.  We have Exchange 2010 on premise.  Her email account continually stops updating and receiving emails.  If she hits Send/Receive - Update Folder it will pull in most of her messages but not all of them.  OWA has all her messages.  I have tried the following

1. File - Account Settings - Unchecked Cached mode and restarted Outlook Then checked Cached Mode and restarted Outlook.  -  This made her Inbox update for a night then issue returned.

2.  I renamed OST to .old and restarted Outlook.  This made the Inbox Update for a few hours then issue returned.

3.  I created a New Profile and started Outlook and let her Inbox rebuild and download messages.  This made the inbox receive messages for rest of the night then issue returned today.

4.  I checked Send/Receive group settings and made sure the "schedule " box is not checked and the send/receive f9 box is checked.

5.  Ive made sure her inbox is not full and reached capacity of our 2gb limit.  Her inbox is about 600MB.

Any Ideas?
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AmitIT ArchitectCommented:
Check the Add-ins in outlook disable them if not required.

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Nick RhodeIT DirectorCommented:
Does it work fine if you turn off cache mode?  Or turn on cache mode?  You could try flushing the cache in case something is corrupt.

Cleanup Cache Mode: http://www.experts-exchange.com/Software/Office_Productivity/Groupware/Outlook/A_12258-Outlook-Cache-Mode-Cleanup.html

Also does this problem happen to the same user on perhaps another workstation?
Mahesh SharmaCommented:
This seems to be outlook machine specific issue.
Try on a different machine.
Outlook /safe, outlook /resetnavpane switches
MS office reapir
New Windows profile
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