Hello, I'm working on the transition to Exchange 2010 from Exchange 2007. I'm using only one physical server. The thing is that when I try to install Exchange 2010, the wizard pops up a message saying: "A previous version of Exchange Server is already installed on this machine". Is it obligatory to use different physical server to do this? Thanks in advance, John 3D

Yes, You are trying an inplace upgrade from Ex 2007 to Ex2010, which is not supported. For this you have to prepare another machine and install ex2010 there, and then move all mailbox and public folder data there, also move all OAB generation and distribution there, configure new Ex 2010 CAS server for OWA and outlook, and then verify all services on new ex2010, and then uninstall old ex 2007. Hope this help u. Regards,Laeeq Qazi|Team Lead(Exchange + Sharepoint + BES + DynamicsCRM) www.HostingController.com

Hi, Plz also visit these links: Migrating from Exchange 2007 to Exchange 2010 http://www.networkworld.com/community/node/47778 Migrating to Exchange 2010 - what you need to know http://www.computerworlduk.com/technology/applications/enterprise/how-to/index.cfm?articleid=2714 Regards,Laeeq Qazi|Team Lead(Exchange + Sharepoint + BES + DynamicsCRM) www.HostingController.com

In addition to Laeeq, the Exchange Deployment Assistanct will give you a good step-by-step guide. http://technet.microsoft.com/en-us/exdeploy2010/default.aspx#Home Tim Harrington - Catapult Systems - http://HowDoUC.blogspot.com