Ive finally had a bit of time to play with Exchange 2013! Ive got a lab setup with Exchange 2010 and Ive installed Exchange 2013.
Ive noticed that with my config I have all urls currently pointing to exchange 2010 and it proxies requests dependent on where your mailbox is. All external stuff is pointing to 2013 eg OWA and the 2013 FBA appears and 2013 and 2010 users can login.
My question is, how does the OAB work? I tried to use the Default Offline Address Book (ex2013) for the 2013 DBs that was built during install but I get an error downloading OAB in outlook (internal and external). When I use the ex2010 offline address book all is ok. Ive also noticed the guid folder does not exist for 2013 under Default and Backend websites (this is true even if I try to create a new OAB). I created a standalone Exchange 2013 server (no 2010) and the OAB stuff seemed ok.
Does the OAB not get proxied? During migration do you still use the 2010 OAB until the end and then transfer it?
Thanks in advance