Hi, Can you have exchange 2010 coexistence with both exchange 2007 and 2003. I have one exchange 2003 box that basically houses our unity voice-mail mailbox and SMTP traffic, the public folders are replicated to our exchange 2007 box. We have 2 exchange 2007 box's, both with all three roles. I am getting ready to put in our first exchange 2010 box with the CAS/HT roles. Is it alright to have coexistence with all 3 and if so do I proceed like I am transitioning from exchange 2003 or from exchange 2007? Thank you.

Sure can, as long as both Exch 2003 and 2007 are at SP2 levels. Start here: http://technet.microsoft.com/en-us/exdeploy2010/default.aspx#HomeTim Harrington | MVP: Exchange | MCITP: EMA 2007/2010, MCITP: Lync 2010, MCITP: Server 2008, MCTS: OCS | Blog: http://HowDoUC.blogspot.com | Twitter: @twharrington

Sure can, as long as both Exch 2003 and 2007 are at SP2 levels. Start here: http://technet.microsoft.com/en-us/exdeploy2010/default.aspx#Home Tim Harrington | MVP: Exchange | MCITP: EMA 2007/2010, MCITP: Lync 2010, MCITP: Server 2008, MCTS: OCS | Blog: http://HowDoUC.blogspot.com | Twitter: @twharrington Aww, perfect, Thanks TW!