Yes and no...
First, doing this is NOT recommended or supported by Microsoft.
Translated - If you have problems you are on your own. <g> Second, many
(Most) third party add ins are going to cause some problems and may even
crash either version.
With that said, I've been able to do it, after removing my add ins.
Austin Myers
MS PowerPoint MVP Team
Provider of PFCMedia, PFCPro, PFCExpress
http://www.pfcmedia.com