ORNIC USA has released a new version of InboxRULES for Outlook which brings a possibility to run rules manually on selected folder.
inboxrules for outlook - run rules now
Rules can be run manually on all messages in selected folder. You just select what rules should be processed and in which folder they should be run. The rules can be chosen from all ones that are already defined in InboxRULES.
New version can be downloaded from this page.