How to Define Multiple Exchange version in Exchange Binding

Question

How to create the below code for EXCHANGE SERVER version like 2007_sp1 and 2013_sp1, in co-existence scenario.

 

esb.RequestServerVersionValue.Version = ExchangeVersionType.Exchange2007_SP1;

esb.RequestServerVersionValue.Version = ExchangeVersionType.Exchange2013_SP1;

The code should redirect the request depending on the location of Mailbox.