You do not need to uninstall Office 2007 before installing Office 2010.

I just did it. Went from Office 2007 Pro to Office 2010 Pro Plus.

The 2010 disc recognized a previous version of Office on the PC and asked if I wanted to do a full install, or an upgrade. I opted for the upgrade. It went fine. Just remember to go back and open the programs, go to the Help screen and enter your new Office 2010 product key to complete the activation.

I have another PC with Office 2003. I will uninstall that version before going to Office 2010. Going from 2003 to 2010 is a major upgrade. Going from 2007 to 2010 is a minor move.

We are not a power user, e.g. no custom templates, etc. Some other chats I saw suggested that you back up your templates before uninstalling. Not sure why, but cant hurt.