If you imported your rules from a previous version of Outlook and somehow all of them or many of them got marked “and on this computer only” and they are not processing correctly, you can fix them by one by one opening each rule, and re-selecting the destination folder (it should already be highlighted). Then, clicking “Finish.” The “on this computer only” should have dropped from the rule description. Then click “Apply” to save all your changes.
Oh, the pain of the Microsoft Outlook Rules and Alerts editor!
[…] Outlook Rules Wizard (Office 2010) […]