Upgrade Exchange 2003 to Exchange 2010
On the Exchange 2003 server:
Exchange Server 2010 can easily coexist in a Exchange Server 2003 organization as long as the Exchange Server 2010 prerequisites are met:
- The Active Directory forest needs to be in Windows Server 2003 forest functionality mode;
- All domains that contain Exchange recipients need to be in Windows Server 2003 domain native mode;
- The Global Catalog Servers and the Active Directory Schema Master need to be at a minimum level of Windows Server 2003 SP1 (which equals to Windows Server 2003 R2);
- The Exchange 2003 organization needs to be running in ‘native mode’;
- Link State updates on all Exchange Server 2003 servers need to be disabled according to Microsoft knowledge base article ‘Suppress Link State Updates’
Suppress Link State Updates on Exchange 2003
To perform this procedure, you must log on to the Exchange 2003 server by using an account that is delegated membership in the local Administrators group.
- Open Registry Editor.
- Locate HKEY_LOCAL_MACHINESystemCurrentControlSetServicesRESvcParameters.
- Right-click Parameters and select New | DWORD value. Name the new DWORD value SuppressStateChanges.
- Double-click SuppressStateChanges.
- In the Value data field, enter 1.
- Close Registry Editor, and then restart the SMTP service, the Microsoft Exchange Routing Engine service, and the Microsoft Exchange MTA Stacks services for the change to take effect.
Install Exchange 2010
Note that the installation will create a connector which will route all outgoing SMTP mail through the Exchange 2010 server. Make sure you have the proper DNS and SPF records configure to ensure proper delivery.