Go for swing upgrade. Install Exchange 2K3 on a separate machine in the same organization. Move mailboxes from 5.5 to 2K3. Make a fresh install on your old server of the OS and exchange 2k3. Move mailboxes back. You can install an aditional 5.5 in the same organization as rollback machine as contingency before starting the whole procedure. Chand ________________________________ From: Uchay [mailto:uchay@xxxxxxxxxxx] Sent: Friday, February 18, 2005 4:09 PM To: [ExchangeList] Subject: [exchangelist] Upgrading from Ex5.5 to Ex2003 http://www.MSExchange.org/ Hello Everyone, My company is about to upgrade our Exchange server but the upgrade method is giving us headaches. I'll like some advice regarding which method would be less problematic for us. A month ago we tried an in-place upgrade of Ex5.5 to Ex2000 which failed forcing us to rollback to Ex5.5. Based on advice received we have decided to upgrade directly to Ex2003 bypassing Ex2000. In-Place upgrade - we upgrade the existing 5.5 server to Ex2003. or Swing Upgrade - we deploy an Ex2003 server into the existing site, and move mailboxes from the Ex5.5 to it; upgrade the old Ex5.5 server and move the mailboxes back. My organization has a single site; double server configuration with just over 2000 mailboxes and we are running a mixed-mode Windows domain. Help please. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: cdd@xxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx