In my test lab I have 4 exchange servers
Svr1 - Site 1
Svr2 - Site 1
Svr3 - Site 2
Svr4 - Site 2
All of the above servers are configured in a DAG.
Datacentre activation co-ordination is enabled.
Svr 4 has a database called DB1 that is not part of the DAG and has some test user accounts in it.
I kill the WAN link and go to my Windows 8.1 test vm that is also in site 2. I log on using one of the accounts that has a mailbox in DB1 and open outlook. The autodiscover process works but after that it fails to connect to DB1.
I also expected applications to be able to relay through either svr4 or svr3 whilst the WAN link is down but this also doesn’t seem to work. I have an application receive connector on all the exchange servers.