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For Client Access servers that are in a CAS Array you should remove some of the servers (eg half of them) from the load balancer configuration, upgrade them, re-add them to the load balancer, then repeat the process with the remaining Client Access servers in that load balanced array.
For an example of how to do this with Windows NLB see the following article: For other load balancers refer to your vendor documentation for how to take servers out of the load balanced array for maintenance and updates.
Client Access servers are the first server role to update, and you should begin with the internet-facing site if you have multiple sites in your organization.
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The upgrades steps are very straightforward and easy to follow. When the splash dialog appears click Install Microsoft Exchange Server upgrade. Warnings will not prevent you from proceeding, but you should pay attention to them anyway as they are often important.
You’ll need to click through the usual introduction and license agreement. Remember, if you’re upgrading CAS Array or DAG members refer to the guidance above. The actual installation time will vary depending on the server roles installed, and whether you’re upgrading from a very recent or much older Service Pack level of Exchange.
These Help articles were created and revised in response to the feedback that we received from you on Microsoft Office Online and Microsoft Developer Network (MSDN).