A simple and effective solution, create another gmail account for yourself <youname>_<officemail>@gmail.com and forward any mails you want to keep around. No more annoying ‘reached account size’ mails and easy to search rather than trying to get outlook to search.
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Devender's Musings 
On top of that you can even use the newly created gmail account as a netwrok drive local to your desktop, by using a freeware called gmaildrive.
Linky
http://en.wikipedia.org/wiki/GMail_Drive