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Ugrading Exchange 2007 SP2 to SP3 upgrade question?

Exchange SP3 upgrade  Installation Order
•      Upgrade CAS servers
•      Upgrade HUB servers
•      Upgrade Edge servers
•      Update Mailbox Servers and CMS (cluster mailbox server) Install Passive Mailbox Server first from the command line. Setup /m:upgrade `

After I install SP3 on the Passive Mailbox Server , can I install on the Active Server, or do I have to move the cluster and  make the active server passive to install SP3 upgrade
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Your have corrected your steps for SP3 installation:

Exchange SP3 upgrade Installation Order
•      Upgrade Edge servers
•      Upgrade CAS servers
•      Upgrade HUB servers
•      Update Mailbox Servers and CMS (cluster mailbox server) Install Passive Mailbox Server first from the command line. Setup /m:upgrade
For Installing SP3 on CMS, better to move your exchange services to other server (passive node)before upgrading (Active Node) it because it may intrupt your mailflow for some time. I mean make your active server, passive first before upgrading.
It is recommended you read the Microsoft Technet article before doing this. The article recommends to follow the same procedure followed to upgrade SP2. But take extra care when you are upgrading the CCR


Very Very Important thing
Once the passive server gets restarted and is back online, it will be running Exchange 2007 SP2. Do note that the active node is still online and serving the users. We need to upgrade the Clustered Mailbox Server (CMS) now, before we upgrade the present active node.

Before upgrading the CMS, we need to stop the CMS that is running on the active node and then move it to the passive node (upgraded server). This step will result in exchange server becoming unavailable for CMS users and hence has to be done out of hours.


355LT1Author Commented:

I confused because MS technet informed me to upgrade in a different  order than yours, please advise.

We recommend that you upgrade your servers that are running the Mailbox server role after you upgrade your servers that are running the server roles in the following list. Upgrade your computers in the following order:

Client Access servers

Unified Messaging servers

Hub Transport servers

Edge Transport servers

Mailbox servers

If you upgrade your servers in this order, you may avoid potential service interruptions.

Yes this is the order you need to follow as in your comment
But when you come to the process of upgrading Mailbox server having a CCR( it would be definitely be on a single server). Then please make sure you follow the recommendations provided by me. All other roles would be a straight forward upgrade.
It is based on scenarios; If you are using Unified or not, whather u have a edge server or not. It depends,

Better first of all tell me your scenario, How many and which server roles you have.

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