Just searching Google with the title of this thread gives a lot of interesting references for you to look at.
One for instance seems to point out that the SharePoint 2007 Exchange web parts can not be used with Exchange 2010.
(I don't have any more. I'm a firm believer in trying to keep key systems in sync so wouldn't use a MS 2010 product with SP 2007 if I could help it)
SP 2010 "FAQ" (mainly useful links):
http://wssv4faq.mindsharp.com/default.aspx
WSS3/MOSS FAQ (FAQ and Links)
http://wssv3faq.mindsharp.com/default.aspx
Both also have links to extensive book lists and to (free) on-line chapters