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I am not able to go to File/Options/Advanced, and in the Display section, change the number of Recent Documents because it is grayed out. Where do I need to got to unlock this?

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Can you update with more information about if this is for you at home, or on a work PC (part of a domain), also if you're logged in / have admin permission. – Nick Josevski May 17 '11 at 6:19
Also which 'Suite' of Office you have; 'Home and Student','Home and Business', 'Standard', 'Starter', 'Professional', 'Professional Academic', 'Professional Plus' – Nick Josevski May 17 '11 at 6:38
Thanks for getting back. I'm using Office Pro 2010, Windows 7, on my personal laptop so I've got full permissions. – Eric May 19 '11 at 3:39

This setting can be controlled by Group Policy. If you have privacy software running on your system, you may have inadvertently enabled this policy.

Browse in your registry to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer and look for a NoRecentDocsHistory value. Delete the value or set the data to 0 and then run gpupdate /force or reboot.

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