Prepare AD Domain and Schema for Exchange 2013 CU21
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Issue: You need to prepare the Active Directory Domain and Schema for the installation of Exchange 2013 CU21.
Background: Exchange 2013 CU7(potentially CU10 w/organization object) was the last version of Exch 2013 to contain a schema upgrade.
Action Plan: Review the scenarios below to determine whether a schema upgrade is required in addition to domain upgrade, then follow the appropriate steps outlined below.
The following scenarios require an AD Schema upgrade (/PrepareSchema) and AD Read more [...]
Exchange 2013 includes a self signed SSL Certificate to facilitate SSL encryption. However, this self-signed cert is not recognized by web browsers and mobile devices and will cause security warnings and connection failures. The solution is to utilize an SSL certificate from a recognized third-party certificate provider (like GoDaddy, NameCheap, Etc). If you haven't purchased a new cert yet, here is my quick guide to dependable and cheap ssl certificates.
How to create a new certificate request 
The easiest way to configure the Exchange 2013 Virtual Directories is by using the 'Configure External Access Domain' wizard in the new Exchange Admin Center GUI. The Wizard will automatically configure all of the Exchange 2013 External URL's to use the DNS hostname you specify. Note: In most cases the default internal URL's are acceptable and can be left alone.
Why I wrote this article? Most of the available docs are for the command line based Exchange Management Shell (EMS) or have bad