Updating Exchange Server 2010 SP2 into SP3 RU 7 with no DAG ?

Hi People,

So... what is the best-suggested way to perform patching or upgrade to SP3 CU7 of the Exchange Server 2010 SP2 (2x MBX Server no DAG) with minimal down time to email services?

The current Exchange Server 2010 SP2 setup is as follows:
2x mailbox standalone no DAG
2x HT-CAS server configured with Windows NLB, SMTP email and outlook configured using Virtual NLB name.

Thanks.
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Senior IT System EngineerIT ProfessionalAsked:
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tshearonCommented:
Since you have no DAG you are going to have mailbox down time. You should not have mail flow disruption however since you have multiple hub roles. Upgrade to SP3 starting  with the CAS roles first, then the HUB roles (unless they are already on the same servers with the CAS), then the mailbox. Then update to RU7 in the same order.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Yes, the HT/CAS are in the same box.
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tshearonCommented:
So then upgrade to sp3 on the CAS/hubs one at a time then the mailboxes one at a time ensuring each are up before you start the other. Then do the same with RU7.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
ok, so what could go wrong when you implement the SP3 upgrade or RU patch ?

have you done it before or is there any caveats that I need to be aware of  ?
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