<div>
Have a look here:<br />
<a href="https://blogs.technet.microsoft.com/exchange/2017/06/13/net-framework-4-7-and-exchange-server/" rel="ugc">https://blogs.technet.microsoft.com/exchange/2017/06/13/net-framework-4-7-and-exchange-server/</a>
</div>


<div>
I know - the content of this link is equivalent to the one I posted. &nbsp;<br />
I cannot find the two patches that they ask me to uninstall.
</div>


<div>
Hi Ralph,<br />
<br />
It is normal that you do not have all the patches.<br />
<br />
You need to check the one with the system:<br />
<br />
Windows Server 2012&gt;&gt;&gt; KB3186505<br />
Windows Server 2012 R2 &gt;&gt;&nbsp;KB3186539<br />
Windows Server 2016&gt;&gt;&gt; KB3186568<br />
<br />
It depends which version you have. <br />
<br />
If there are none..it means you should have the correct net framework version.<br />
<br />
Regards<br />
Valentina
</div>


<div>
I know. &nbsp;As I said above. &nbsp;I have looked for them and I cannot find them.<br />
Still I get this message from Exchange setup.
</div>


<div>
I have the impression not all installed patches and updates are listed. &nbsp;Can I somehow uninstall this via PowerShell?
</div>


<div>
Thanks Todd, yes, that helps. &nbsp;I was not aware of these details, but in general planned to do just that.<br />
<br />
my main issue is: &nbsp;I can't remove NET Framework because I can't find the relevant Updates to uninstall. &nbsp;Have the KB-Numbers changed recently? &nbsp;Several articles quote KB3186539 as relevant to my installation, some add KB3186568. &nbsp;Both are not to be found on my machine.<br />
<br />
Is there another way to return to .NET Framework 4.5.2?<br />
<br />
Another question: &nbsp;I did not at first glance manage to download CU15 - it said this update was outdated and only the most recent (i.e. 18 AND for some reason 19) can be downloaded...
</div>


<div>
To get those previous CUs, you will need to contact support.
</div>


<div>
Just a quick update:<br />
Still not an nich further. &nbsp;Cannot uninstall any .NET Frameworks because all the KB-Patches listed in the relevant posts and forums are not listed under &quot;installed updates&quot; on my machine.<br />
Also I cannot install a newer CU because setup.exe sais .NET Framework 4.5 or newer is required for installation. &nbsp;Since the machine is still moderately doing what it is supposed to do, I did not touch too much.<br />
Might try to migrate to Exchange 2016 and kill this machine altogether.
</div>


<div>
Still no progress.<br />
It's supremely frustrating, because it looks as if it's just a tiny step that is missing.<br />
.NET Framework 4.7.1-Patch is not listed unter installed updates.<br />
Cleanup-Tools say everything is fine.<br />
Verfiication tools check out fine.<br />
I don't get past the very very first line of running setup.exe of CU18 or 19 and even bringing up the installer. &nbsp;<br />
<br />
No idea where to go from here. &nbsp;Maybe it's best to give up.
</div>


<div>
Ok, I'm a bit further, but by far not there.<br />
First, the Patch for .NET Framework 4.7 was not KB3186539 as it should be according to multiple sources, but instead KB4033342 on my machine. &nbsp;I uninstalled that, and was back to 4.5.2. &nbsp;First of Todd's steps: &nbsp;done.<br />
Then I moved heaven and hell to get my hands on a CU15. &nbsp;I got it, but unfortunately it does not install - just like CU18 or CU19.<br />
<br />
It sais this:<br />
Exchange Server 2013 requires .NET Framework 4.5 or later. Download it from <a href="http://go.microsoft.com/fwlink/?LinkId=260991" rel="ugc">http://go.microsoft.com/fwlink/?LinkId=260991</a>.<br />
<br />
So I downloaded net framework cleanup tool and netfx setup verifier from here:<br />
<a href="https://blogs.msdn.microsoft.com/astebner/2008/10/13/net-framework-setup-verification-tool-users-guide/" rel="ugc">https://blogs.msdn.microsoft.com/astebner/2008/10/13/net-framework-setup-verification-tool-users-guide/</a><br />
<br />
It sais all is well. &nbsp;I got the .NET Framework 4.5.2 offline installer and installed that, no gain.<br />
<br />
Also I stumbled over this:<br />
<a href="https://justaucguy.wordpress.com/2017/07/03/a-bridge-too-far-exchange-2013-cu15/" rel="ugc">https://justaucguy.wordpress.com/2017/07/03/a-bridge-too-far-exchange-2013-cu15/</a><br />
<br />
It explains my case quite well and also confirms Todd's steps. &nbsp;Except I can't go them because the f#* installation does not start.<br />
<br />
Anyone? &nbsp;Please?
</div>


<div>
Sufficient information provided for resolution.
</div>


<div>
<div class="content wysiwyg-content">
Hi,<br />
<br />
I was asked for help with an Exchange Server 2013 CU6 on Windows Server 2012 R2 which was behaving in an odd way. &nbsp;Wanting to patch it, I found out that .NET Framework 4.7.02558 is installed. &nbsp;(that's what it sais in HKLM\Software\Microsoft\NE<wbr />T Framework Setup\NDP\v4\Full)<br />
Trying to install CU18 or CU19 I get first thing: &nbsp;.NET Framework 4.5 or higher is required to install Exchange Server.<br />
<br />
I read this:<br />
<a href="http://msexchangeguru.com/2017/06/18/net-framework-4-7-do-not-install/" rel="ugc">http://msexchangeguru.com/2017/06/18/net-framework-4-7-do-not-install/</a><br />
<br />
The named KB3186539 and KB3186568 are NOT installed (at least I can't find them in the list - it seems to stop at KB37... and then carries on with KB40... &nbsp; There is only one or two KB38...-Patches in the list.<br />
<br />
Don't know what to do now. &nbsp;Any ideas?<br />
<br />
Thanks,<br />
Ralph
</div>
</div>


Hi,

I was asked for help with an Exchange Server 2013 CU6 on Windows Server 2012 R2 which was behaving in an odd way.  Wanting to patch it, I found out that .NET Framework 4.7.02558 is installed.  (that's what it sais in HKLM\Software\Microsoft\NET Framework Setup\NDP\v4\Full)
Trying to install CU18 or CU19 I get first thing:  .NET Framework 4.5 or higher is required to install Exchange Server.

I read this:
http://msexchangeguru.com/2017/06/18/net-framework-4-7-do-not-install/

The named KB3186539 and KB3186568 are NOT installed (at least I can't find them in the list - it seems to stop at KB37... and then carries on with KB40...   There is only one or two KB38...-Patches in the list.

Don't know what to do now.  Any ideas?

Thanks,
Ralph

Exchange 2013:  NET Framework 4.7 on CU6

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Windows OS

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.