You can use both versions if you wish, without uninstalling Office 2003. When installing different Office versions, you should always install the older version first, so that part's already taken care of. If you do decide to uninstall Office 2003, Office 2010 should pick up any Office 2003 customizations you had, as those files don't get deleted.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Well, here goes....I am going to try the uninstall the 2003 and then install the 2010....I'll keep you updated.
PS...I did a full Ghost back up............Justin Case ;o)

Things did NOT turn out the I or we would have liked it too. The Office 2010 installed just fine but would not or could not ACTIVATE.I call MS and they said the "key" was valid and good............and for $99.00 they would remotely fix the problem in my computer. I reminded them that it is not a problem with my computer, it was the ACTIVATION problem. So after 4 phone calls, I get a phone back late last night from a higher level supervisor (no doubt outsourced) a really nice man and he explained to me that the Key, Software was good BUT has to used on a corporation server and is not for home use. It is made to be used on (up to) 10 computers. And also it had been limited out............so the bottom line is a I but a bogus piece of software. NOW this was purchased (I can't remember when) about 12 - 18 months ago and sat on the shelf until yesterday. Although I am not happy about it, Microsoft was REALLY NICE about it all and did try to sell me other software.....but for only ONE computer and our house ahs 4 computers. Maybe that's what caught my eye when I purchased it and missed the other FINE print (
Nuff Said!