The first step is to understand what the code does: It loops through all the items in the folder that is currently displayed to the user and changes various property values. If that fits your needs, then to try it, all you have to do is display the folder you want to work with and possibly change what properties you want to change.
If you're new to Outlook VBA macros, these web pages should help you get started:
http://www.winnetmag.com/Articles/Index.cfm?ArticleID=21522&pg=1
http://www.outlookcode.com/d/vb.htm
FYI, there is a newsgroup specifically for general Outlook programming issues "down the hall" at microsoft.public.outlook.program_vba or, via web interface, at http://www.microsoft.com/office/community/en-us/default.mspx?dg=microsoft.public
.outlook.program_vba

Signature
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I want to try and experiment with Sue Mosher's code from her site (
> http://www.outlookcode.com/d/code/convertfields.htm ) in my OL2003 contacts.
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>
> Thanks, Tim