Hi Elcia,
Whit it's possible to do this, it's generally not a practical approach, especially when Outlook is in both of the 2003 Editions you
mentioned, and also uses two product licenses (although Basic Edition is tied permanently to the machine its first installed on).
After backing up your files, set a Restore Point in Windows. If you then uninstall the Basic Edition, restart the PC then install
the Office 2003 Professional Edition to the same folder you should be okay and it will be easier/cleaner to maintain with updates.
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Is it possible to install applications from two different Office 2003
editions on one desktop? For example: Word and Excel from Office 2003
Professional and Outlook from the Office 2003 Basic edition?
Do those applications use Office features from their own editions in such
case (esp. IRM)?
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thanks in advance for any help!
elcia >>
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I hope this helped you,
Bob Buckland ?

MS Office system products MVP
LINKS to the 2007 Office System Beta
1. Free MS Office 2007 book from MS Press, 213 pages:
http://microsoft.com/learning/office2007/default.mspx#booksfrommspress
2.. Office 2007 Beta 2 Online Test Drive, Downloadable beta,
e-learning courses, doucmentation and movies:
http://microsoft.com/office/preview
3. Try the 2007 OfficeOnline preview website , without Office2007
a. Install the ActiveX access control
http://office.microsoft.com/search/redir.aspx?AssetID=XT101650581033
b. then visit
http://officebeta.iponet.net