I know my SBS 2003 is SP2 from My Computer, so how to check service pack version for exchange 2003 using now ? Thanks

Hello, Open Exchange System Manager (ESM) -> Admin Groups -> click on Servers Folder -> In right pane you can see list of all the servers in that admin group & a column named "Server Version". You can find the service pack and version/build of Exchange Server there. Reference: Build numbers and release dates for Exchange Server http://support.microsoft.com/kb/158530