Just realized I posted this in the NTSysadmin list this morning. Sigh. Never said I was the sharpest tool in the shed. ***************************************************************************************************************************** Although I realize this is an extremely broad question, I am planning on building a 2008 R2 member server and bringing Exchange 2010 RTM up on it in a native mode 2003 production domain. My plan is to move my and an associates mailbox to it so I can poke, prod shake and bake to get hands on experience with the new stuff. Once done I would retire the server and plan on a production environment. I've read an overwhelming amount related material on the web. Can anyone anticipate any gotcha's or the like? Any and all responses greatly appreciated. Thanks. Steve