During set up, the Synchronization wizard prompts you for all the
relevant information. However, after set up you can change Exchange
Server name/IP, synchronization interval and the Exchange sites that
are synchronized. This can be done from the General > User
Synchronization node. Right click on the node to bring up the User
Synchronization Properties dialog.
Here you can change Exchange Server machine IP & synchronization
User synchronization properties
Clicking on the sites button allows you to specify which sites you want
GFI MailSecurity to synchronize with.