Choose Tools/Options and on Preferences click "Calendar Options". In the
Calendar Options panel, select "Show Week Numbers". In the Date Navigator
checkbox, click "OK" twice.
I Found this on: http://www.uky.edu/IS/Training/Tips/tipsoutlook.html
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Oliver Vukovics
Outlook Network without exchange: Public OutLook
Share your Outlook PST with several users. http://www.outlookstore.com
Now the Date Navigator shows the week numbers to the left of the first day
in the week