Looking for the best way to upgrade the existing 2003 Exchange environment with Windows 2003 Server to Exchange 2007 with Windows Server 2008. looking for a document with step by step instructions.

this should help start with the planning and also with the installation pre-reqs etc.http://technet.microsoft.com/en-us/library/aa995902.aspxhttp://technet.microsoft.com/en-us/library/bb124008.aspxand this http://technet.microsoft.com/en-us/library/aa997617.aspx

Exchange migration:http://www.msexchange.org/tutorials/Transitioning-Exchange-2000-2003-Exchange-Server-2007-Part1.htmlhttp://www.msexchange.org/tutorials/Transitioning-Exchange-2000-2003-Exchange-Server-2007-Part2.htmlhttp://www.msexchange.org/tutorials/Transitioning-Exchange-2000-2003-Exchange-Server-2007-Part3.htmlAlso http://technet.microsoft.com/en-us/magazine/2006.12.upgrading.aspxWindows server migration:http://technet.microsoft.com/en-us/library/cc755199(WS.10).aspxAdditional considerations;http://technet2.microsoft.com/windowsserver2008/en/library/8519f859-7159-4dae-ba4c-8ed791c01be01033.mspx?mfr=true http://technet.microsoft.com/en-us/library/cc755199.aspx#BKMK_Supported Raj