Hi Cesare,
Moving between products within the same Office product
series, in this case 2003, is seen by MS as a 'crossgrade'
rather than an 'upgrade'. MS Office Project 2003 Standard
is not a qualifying product for the Upgrade edition of
MS Office Project 2003 Professional.
http://microsoft.com/office/project/howtobuy/stdpricing.mspx#EDAA
FWIW, you may want to post questions specific to MS Project
in the Project discussion group, links below.
==========
hello, can i upgrade from project 2003 standard to project professional 2003
using the VUP ( version upgrade edition ) ? there will be some technical
probelm?
thanks>>
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LLet us know if this has helped you,
Bob Buckland ?

MS Office System Products MVP
*courtesy is not expensive and can pay big dividends8
A. Specific newsgroup/discussion group mentioned in this message:
news://msnews.microsoft.com/microsoft.public.project
or via browser:
http://microsoft.com/communities/newsgroups/en-us/?dg=microsoft.public.project
B. MS Office Community discussion/newsgroups via Web Browser
http://microsoft.com/office/community/en-us/default.mspx
or
Microsoft hosted newsgroups via Outlook Express/newsreader
news://msnews.microsoft.com