Question about upgrading Exchange 2007 SP2 to SP3

Has anyone upgraded and an Exchange 2007 SP2 to SP3 Enterprise Enviorment, what is the best method or order per CAS/HUB , Edge Server, Mailbox server, SCR active or passive, any problems to look out for?
355LT1Asked:
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Glen KnightCommented:
Yes, its' fairly stright forward, make sure you update the CAS first.
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Update in the following order. CAS, HUB, Edge and Mailbox.

This one is for CCR, but will give you an idea. http://www.howexchangeworks.com/2009/08/upgrading-exchange-2007-ccr-to-sp2.html

If you have Forefront installed, that has to be disabled before upgrade and enabled afterwards.
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355LT1Author Commented:
Rajith,

Are you confident upgrading from SP2 ccr to  SP3 ccr is the same as upgrading from SP1 ccr to SP2 ccr  in the link you provided?
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Glen KnightCommented:
The process is identical.
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355LT1Author Commented:
Would the scr servers be same as ccr server upgrades?
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