Origianlly UNity 3.12 only installed exchange5.5 administration software to connect to exchange 5.5. NOw exchange 5.5 upgraded to 2000. Can I upgrade exchange 5.5 administration software to exchange 2000 administration software in order to this unity work with 2000 exchange? Or I have to delete 5.5 and install 2000 admin. software? Any document I can read? Thanks<br><br>