Through my email consulting I am amazed at the number of customers who are still using Exchange 2003. Exchange 2003 has been out of support for nearly six months now, and these companies are running a business risk by remaining on Exchange 2003. Especially as the Exchange 2003 servers are also running Windows 2003 as the Operating System. The main reasons for staying on Exchange 2003 seem to be lack of investment in IT, and lack of staff skills to move off it.
Always keen to hear from people who are still using Exchange 2003, and the reasons why they have not migrated off it. Migrating to Exchange 2010 SP3 is the best option for these companies, as Exchange 2010 is a stable, mature product, and there is a wealth of information out there on how to do the migration.