Hi,
I'm currently planning out an Exchange 2013 migration from an existing 2007 environment. The current environment has 2 Edge 2007 servers with edge subscriptions in place.
After I have installed 2013 MBX+CAS and then installed the Edge Transport servers the Exchange Deployment Assistant talks about creating new Edge Subscriptions to the 2013 Edge and the 2013 MBX+CAS boxes. If I do this will this have any effect on current email routing? Will this cause outbound email to start going out via the 2013 Edge Servers?
I'm thinking it probably wont unless the user has a mailbox on 2013 but I'm not 100% sure as I haven't encountered this before and would like to know so I can plan whether to do this activity during a downtime window so as not to disrupt mail flow.
Thanks