you'll need an add-in to do that - Outlook cannot.

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Here are some tips about how to post questions:
http://support.microsoft.com/?id=555375
Regards
Judy Gleeson
MVP Outlook
Trainer and Consultant
There are various articles about using Outlook here:
www.judygleeson.com/articles.aspx
Canberra, Australia
"What do we live for, if it is not to make life less difficult for each
other?"
George Eliot
> I've tried all the options but I can't specify recurrence for e.g 4th
> working
> day of the month, just 4th day of the month.
>
> Help!