outlook does not archive emailes stored on exchange server

Hi,
My customer has Outlook 2010 running against Exchange 2007 (SBS2008).

Outlook 2010 is only set to store 6 months cached locally (i.e. in the .ost file)

There is email going back to 2010 on the server i.e. in his Exchange mailbox.

When archiving is run in Outlook it is not finding anything to archive.

Why is this ?  Am I missing something about the way this is supposed to work ?
Michael GreenSenior IT Consultant / IT Project ManagerAsked:
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rscottvanCommented:
Turn off cached exchange mode for archiving, then turn it back on when complete.  

Or let cached Exchange (.ost) store the entire mailbox.  Outlook will only archive what it can see, and in cached mode, there's only 6 months worth of mail.

If you configure Outlook to auto-archive everything 6 months or older, there's no reason to keep the six month limit on the .ost file either.
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Michael GreenSenior IT Consultant / IT Project ManagerAuthor Commented:
Actually I found the issue was the Outlook Last Modified field.  I found a registry change to ignore that field when archiving.  Worked a treat when combined with ensuring that all of the client's emails were cached to the local machine (not just the last six months)
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Michael GreenSenior IT Consultant / IT Project ManagerAuthor Commented:
Found the solution myself.
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