I am trying to add an exchange 2010 server, I am only adding the mailbox role, it is in the same site, as the rest of my exchange environment, it does contain a GC. EXPDA runs with no errors.
When it gets to installing the mailbox role, it ends up failing with "An item with the same key has already been added"
I am attaching the setup.log, and a text file containing the exact error.
Any advice would be appreciated,