Installing Exchange 2010 SP3 RU10

Our Exchange environment has two mailbox servers set up as a DAG, a hub transport server, and a CAS. I'm planning on installing SP3 and RU10.

I'm comfortable with the SP3 upgrade, but should I upgrade all the servers to SP3 first and then install RU10, or can I do install RU10 immediately after installing SP3 on a server?
donohoe1Asked:
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Scott CSenior EngineerCommented:
You are best off keeping all of your versions of Exchange as close as possible.

You need to upgrade to SP3 first on all of your machines then install RU10.

The installation order is important.

Order to apply the Service Pack 3 and a few hints…

The first thing when you are planning is the order to apply Service Pack 3 on your servers. These are the key rules to apply a new Service Pack in your organization.

0.Edge Servers (if you have any)
1.Client Access Server (if you have multiple sites internet facing sites first)
2.Hub Transport
3.Mailbox
4.Unified Messaging

http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/applying-service-pack-and-rollup-updates-exchange-server-2010-part1.html

Install SP3 in the above order and once that's done install RU10 in the same order.

You should be good to go.

Make sure you have a good and tested back up before you start.

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Seth SimmonsSr. Systems AdministratorCommented:
you should go to update rollup 11; i installed it a week ago with no issues

Update Rollup 11 For Exchange 2010 SP3
https://www.microsoft.com/en-us/download/details.aspx?id=49043
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