Exchange 2007 SP upgrade

I am going to upgrade Exchange 2007 SP (Admin Display Version) have done it in the past, dont remember now how i did it, does anyone have steps on how to do it? we have 3 Exchange Servers in 3 different countries, 2 of them are on same version, trying to upgrade third one to be same. i.e.

Name                                                                                             AdminDisplayVersion
----                                                                                                       -------------------
ExchangeServer01                                                                        Version 8.3 (Build 83.6)
ExchangeServer02                                                                        Version 8.3 (Build 83.6)
ExchangeServer03                                                                        Version 8.1 (Build 240.6)

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LeoAuthor Commented:
Thanks, do i have to update domain schema? we are not running exchange on DC......
Also How many roll ups i have to apply to reach to Admin version Version 8.3 (Build 83.6)?
I didnt understand the last comments "After starting the setup without switches I got a message that one of the services needed was disabled.
After enabled this services (all exchange services where disabled) the setup could be continued again.

When trying to install the “Mailbox Role” I had the same problem with a exchange services.
This services is disabled during the setup. After starting the setup again I monitored this services and started it manual after it was disabled"
Can you please clarify what he meant? why the critical services were disabled?
Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
You do not need to update Domain Schema if all three Exchange servers are in the same domain (which I believe it is).

As far as critical services are concerned, best practice is to get a list of all running services and ensure they start and run correctly after the upgrade.
LeoAuthor Commented:
Thank, Which exact Rollup I need to bring it up to Admin Version 8.3 (Build 83.6)?
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LeoAuthor Commented:
This is the output which I got when I checked for RU...

ProductVersion   FileVersion      FileName
--------------   -----------      --------
08.01.0436.000   08.01.0436.000   C:\Program Files\Microsoft\Exchange Server\bin\ExSetup.exe
Jian An LimSolutions ArchitectCommented:
you also should run on your current server to see what RU are they using.
LeoAuthor Commented:
This is on current server...

ProductVersion          FileVersion
--------------                       -----------
08.03.0417.001           08.03.0417.001
Jian An LimSolutions ArchitectCommented:

according to this, you are on Update Rollup 17 forExchange Server 2007 SP3

and the lower one is on Update Rollup 10 for Exchange Server 2007 SP1

you probably just install the RU17 on the server first.

then plan for another upgrade to do "Update Rollup 20 for Exchange Server 2007 SP3" another day.

as long as you have enterprise admin, you don't need to worry about domain schema .. it should have enough access to run the required command
LeoAuthor Commented:
I am planning to put an outage for Exchange over the weekend. so to reach to rollup17 SP3 from Rollup10 SP1, what would be the best way?
Jian An LimSolutions ArchitectCommented:
just double click and install the Rollup, it should be running like 30 minutes

after that, reboot, then done

UNLESS you worried then you need to do backup and etc .. refer to 1st url in this post

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