Outlook 2010/ Cache Mode synchronization appears to hang, or is it?

I have Outlook 2010 on an Exchange 2010 in cache mode.
At times when I open Outlook my synchronization appears to work fine.  At the bottom of the screen I will see the message change from 'updating this folder' to 'This Folder is up to date' to 'All Folders are up to date".. which is how I guess it is suppose to flow?

Other times I notice I am stuck on 'This Folder is up to date.' and when I look at the Outlook icon on the taskbar it is not an Outook icon but two little envelopes that when I hover say 'Microsoft Outlook is synchronizing folders'  It will stay that way indefinitely.  If I look at 'Show Status' on the ribbon it just says 5 of 5 task completed successfully and shows nothing pending.

If I hold the control key down and right click on that same icon and hit 'Connection Status' I get a screen with two tabs 'General' and 'Local Mailbox'.  If I look at Local Mailbox I will always see 1 or 2 activities.  The following are what I have there right now:

'Synchronizing local changes in folder 'Deleted Items'
'Offline Address book connecting to Microsoft Exchange'

Those activities will also stay there, indefinitely.  However, if I return to the 'Local Mailbox' tab, there is a button at the bottom that says 'Reconnect' and next to it  "Click to restore connectivity to Microsoft Exchange.'

Here is where it gets interesting... back on the Outlook interface, everything looks and functions normally.  In the taskbar it says Connected to Microsoft Exchange' and mail comes in normally, etc...  

But, and this happens everytime I have tried it... if I click that 'Reconnect' button on the General tab 1 or 2X... the 'Activities' on the 'Local Mailbox' tab drop off immediately and then, and only then.. does the Taskbar message in Outlook change to 'All Folders up to date'

What is happening?
snyperjAsked:
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tjc123IT DirectorCommented:
How big is your OST file for that account?  You might try closing Outlook, renaming that file's extension to .ostold and then log back into Outlook to have it recreate the OST file and redownload all your mail again.  Keep in mind, this could take awhile if your mailbox is several GBs.
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snyperjAuthor Commented:
It is about 5GB, but I see this on other users too...  so it isn't just mine where this happens.
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snyperjAuthor Commented:
Thanks
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