Here's my scenario: my customer has about 20 PCs, all managed by an SBS 2008 box, running Exchange 2007 SP3. We're gradually migrating them away from that. This weekend, I'd like to patch 2007 to the latest rollup, and install Exchange 2013, but I don't want to move mailboxes, interrupt mailflow, or disturb the users in any way.
If I just install 2013, and don't make any changes (eg, to the Exchange virtual directories, DNS, doing mailbox moves, etc.), is this supported? In other words, I just want to have 2013 installed and dormant, just "sitting there" not doing anything at all until we finally get around to migrating everyone at some later date. I can't imagine that would be a problem, but perhaps I'm wrong?