<div>
Enough information to confirm as answer.
</div>


<div>
<div class="content wysiwyg-content">
I am updating exchange 2013 from CU15 to CU16.<br />
From the documentation I can see that CU15 and CU16 have same schema versions<br />
Exchange &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Forest (rangeUpper) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Forest (objectVersion) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Domain (objectVersion) <br />
2013 CU10-CU16(*) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;15312 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 16130 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;13236 <br />
<br />
Thus I think just running the CU16 installer on the exchange servers should be the only step required in this update.<br />
Is that correct or do I need to still run prepare schema/AD/domain?
</div>
</div>


I am updating exchange 2013 from CU15 to CU16.
From the documentation I can see that CU15 and CU16 have same schema versions
Exchange                     Forest (rangeUpper)                 Forest (objectVersion)                  Domain (objectVersion) 
2013 CU10-CU16(*)            15312                                             16130                                              13236 

Thus I think just running the CU16 installer on the exchange servers should be the only step required in this update.
Is that correct or do I need to still run prepare schema/AD/domain?

Exchange 2013 CU15 update to CU16 - Is prepare schema/AD/domain required?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Windows PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language built on the .NET Framework. PowerShell provides full access to the Component Object Model (COM) and Windows Management Instrumentation (WMI), enabling administrators to perform administrative tasks on both local and remote Windows systems as well as WS-Management and Common Information Model (CIM) enabling management of remote Linux systems and network devices.