I have two exchange servers for the same domain, so half my mailboxes are on exchangeA and half are on exchangeB
I have opened up IMAP on my firewall, to allow users to make use of their blackberries. So, I forwarded the relevant port from my firewall to ExchangeA, and all is well with the world.
Coincidentally, all the blackberry users are on ExchangeA, and everything worked, until one user, who was on ExchangeB could not get blackberry working, until I realised the reason. I figured then I'd make ExchangeB a front end server, by clicking that little box - I thought that meant it would forward IMAP requests to the correct spot, transparent to the user.
It seems that is not the case. What setup do I need, in order for IMAP to be able to function in this setup?