You'll have to experiment and see what works. I have some keywords in
various articles at slipstick.com and outlook-tips.net, but there isn't a
master list. AFAIk, 'weekdays' is not one of the words outlook understands -
days or weeks will work though.

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Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Coauthor, OneNote 2003 for Windows (Visual QuickStart Guide)
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>I know how wonderful Natural Language can be, in advanced find, and am
> thrilled that "relative" date searches are back in OL2003.
[quoted text clipped - 3 lines]
> source list, anywhere, for what words are RECOGNIZED by the natural
> language in Outlook?