Hi Guys We are running Exchange 2003/2007 mixed mode. We have only test users on the Exchange 2007 system at the moment, and have the following servers: ExchCAS - CAS ExchHT ExchHT2 ExchMBX1ExchMBX2 Exchange MBX1 and MBX2 are virtual Exchange servers on an SCC Active/Active/Passive cluster. As you know, MS release update rollups, hotfixes etc for 2007. Is there a recommended order in which to install these? From Exchange 2003, I remember we were advised to install patches on the Front End server first etc. Thank you.

Are you planning on stretching the application of the hotfixes over a multi-day window? It is recommended that all Exchange servers be at the same patch level, but I wouldn't worry about the order in which they are applied. Mike Crowley A+, Network+, Security+, MCT, MCSE, MCTS, MCITP: Enterprise Administrator / Messaging Administrator

Yes, agree with Mike.Howeverrefer my response in below thread for furtherdissection... http://social.technet.microsoft.com/Forums/en-US/exchangesoftwareupdate/thread/4e530744-ae10-4e44-9612-451ef48d6c8bAmit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

For your reference:How to Install Update Rollups in a Single Copy Clusterhttp://technet.microsoft.com/en-us/library/bb885045.aspxRegards,Xiu