Outlook 2010 backing up emails

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http://superuser.com – My hard drive recently started going bad but before it went out I was able to copy most of my files off of it. I had Office 2010 using an exchange server. I had backed up my emails into a local folder in Outlook so the exchange server wouldn't delete them after its retention policy. I looked at F:\Users\username\AppData\Local\Microsoft\Outlook but the only large file I see is an .ost file. From the MS/Office help page it says: Outlook Data File (.ost) The .ost file is synchronized with the items on the server that runs Exchange. Because your data remains on the Exchange server, you can (HowTos)