Exchange 2003 to Exchange 2010

Clarifications

you might start here, http://technet.microsoft.com/en-us/library/dd638130.aspx

and remember google is your friend, http://www.google.com/search?client=ubuntu&channel=fs&q=upgrade+of+2003+exchange+to+2010&ie=utf-8&oe=utf-8

You first need to Consolata the 2 Exchange Servers into one before even starting to think about migrating to a different OS so I would suggest you start off by Consulting the 2 Exchange Servers into 1

http://support.microsoft.com/kb/843104

Then after this is finished and running successfully you can then start to migrate to 2010. This is probably the better option for the second part of this question. ;)

http://lmgtfy.com/

You always break things down to the smallest steps possible and never do more than absolutely necessary. If you roll several reasonably big jobs into one that's a perfect way to have long term Unreliability and outages.

Not a good idea if the Business relies on E Mail which every one that I've ever gone to most certainly does.

Col