Exchange Server Migration from Exchange 2003 to 2010

Hello
I have a Exchange 2003 server  and need to migrate to Exchange Server 2010 on same server (I don't have extra server)-
 
Windows Server 2003 R2 - 32-bit
Exchange Server  2003 (Without SP2)- 32-bit
Need to upgrade to Exchange 2010- is this posisble ? please help me out for migration.

You can get no better help than that in this link:
http://social.technet.microsoft.com/Forums/en/exchange2010/thread/bb9a5a3c-119a-4d66-9b1e-2bfc1028cb98