service pack upgradation on exchange

how to do service pack upgradation on exchange all versions
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Jeff RodgersNetworks & Communications Systems ManagerCommented:
Very loosely the order should be something like this;

1. Find some time during off peak hours
2. Do a Full System backup.
3. Confirm system prerequisites for the Update and make sure they are all done.
4. Check for and fix any errors which should be fixed prior to running update.
5.  Repeat steps 2,3, 4 until no errors are present
6.  Download latest Service Pack from Microsoft and confirm checksum.
7.  Install Service Pack
8.  Reboot
9.  Check for errors and if errors exist fix them... if not, happy computing you are done.

Keep in mind that for best results you will want to fix any glaring issues before you run the updates.
Will SzymkowskiSenior Solution ArchitectCommented:
When you are applying service packs it is recommend that you do the following...
- Start with the Internet Facing CAS servers first
- Then apply to other CAS servers in proceeding AD Sites
- Then apply them to Hub/Mailbox roles

Service packs are backward compatible but it is a best practice to make sure that they are all on the same SP version and RU levels. If for whatever reason you are not able to do all of your servers within the maintenance window, it is best to complete all of the same roles first.

So if you only have time to complete the CAS roles then do this. However the servers that were missed should not be kept in this state for very long to avoid and issues.

Also you should reboot after every SP or RU install to ensure that everything is working after a fresh reboot.


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AmitIT ArchitectCommented:
Follow change management process. Technically, requirement differ with each Exchange and how your Exchange servers are setup in your environment. Like, if you have server or site resilience than the step might totally different. Always read Microsoft installation instruction document. Before patching any Microsoft server.

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