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Are either Apollo or Perseo DC's? &nbsp;And if so, is the DC marked as a Global Catalog?<br />
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Are you making a bit level change; e.g. - Apollo has 2008 32-bit, installing 2012R2 64-bit?<br />
<br />
-saige-
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Apollo is DC, also I have another server &quot;Ares&quot; as a DC, Perseo is not DC..<br />
As Global Catalog, I am not so sure if it´s maked.<br />
No bit leve change, all servers are 64 bit.<br />
Apollo is 2008 R2 64bit and going to 2012 R2 64bit.
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Ok, just to see if I am on the right track..<br />
Just moved all FSMO roles to another server &quot;Ares&quot;, the other server does has the Global Catalog tick, and took away the Global Catalog on &quot;Apollo&quot;, so how can I be sure I wont have an unhealthy Active Directory?
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Microsoft has a wealth of information and tools that are used to perform Active Directory Health checks. &nbsp;The first one you should familiarize yourself with is DCDIAG.<br />
<br />
This tool is primarily used to provide a top-down view of the overall health of AD (but can be used to produce granular reports). &nbsp;When you identify a problem area, that is when you will need to start using more specialized tools; e.g. - FRSDiag for File Replication Service problems.<br />
<br />
<a href="http://blogs.technet.com/b/ptsblog/archive/2011/11/14/performing-an-active-directory-health-check-before-upgrading.aspx" rel="ugc">http://blogs.technet.com/b/ptsblog/archive/2011/11/14/performing-an-active-directory-health-check-before-upgrading.aspx</a><br />
<br />
-saige-
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I have a question...<br />
I removed the Global Catalog from the &quot;Apollo&quot;, and my Exchange server stopped working.....<br />
eventhough &quot;Ares&quot; has the Global Catalog.... do I need to tell Exchange that Ares is the only Global Catalog???
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Exchange should locate the new global catalog but it can take 30 minutes or so.
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Ok, this saturday I will remove Global Catalog from &quot;Apollo&quot;, restar the server, restard de &quot;Exhange server&quot;, and when everything seems working, then I will demote &quot;Apollo&quot;.... &nbsp;I am scared hehehehe
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I found out this... not sure if it is real.... but if it keeps failing, I will try it out:<br />
If nothing else works try this!<br />
<br />
Copied from Mr Johnson: <a href="https://www.experts-exchange.com/questions/28100840/Event-ID-2142-MSExchangeADTopology-Exchange-2013.html" rel="ugc nofollow">https://www.experts-exchange.com/questions/28100840/Event-ID-2142-MSExchangeADTopology-Exchange-2013.html</a><br />
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In exchange 2013 there is now a setting that requires you to have at least 50% of your domain controllers global catalog servers. &nbsp;Without 50% of your DC's being GC's you will get event id 2069, 2060, and 2070 and exchange will fail to find other global catalogs or Domain Controlers in your organization. &nbsp;Took me 80 hours to fix this problem. &nbsp;Thought id share and save others some headaches.<br />
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&nbsp;This can be fixed by editing the &quot;Microsoft.Exchange.Direct<wbr />ory.Topolo<wbr />gyService.<wbr />exe.config<wbr />&quot; file<br />
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&nbsp;Look for this line:<br />
&nbsp;MinPercentageOfHealthyDC = &quot;10&quot;<br />
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&nbsp;Also add this line:<br />
&nbsp;MinSuitableServer = &quot;1&quot;
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Sorry for the delay...<br />
Because I am new at this &quot;Active Directory&quot; thing..., I encountered a problem where Ares even dough it said it was a domain controller, it wasn’t, a proper replication of the &quot;sysvol and netlong&quot; wasn’t present, so every time I turned off Apollo everything went down. &nbsp;so now, I corrected the problem and now I can safely demote apollo to perform a clean install.<br />
<br />
Thank you very much for pointing me in the right direction.
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We have two server: Apollo and Perseo (temporary server)<br />
Apollo has Windows 2008 and Exchange 2010<br />
Perseo has Windows 2012 and Exchange 2016<br />
We migrated all mailboxes from 2010 to 2016 so we can remove Exchange 2010 from Apollo, <br />
<br />
Is it possible to uninstall Exchange 2010 from Apollo and make a Windows 2012 upgrade in place without a format??, then install Exchange 2016 in Apollo and migrate back all mailboxes? We prefer the simple way of in place upgrade, if not, we need to spend a lot extra time moving all the roles to one server and then back to Apollo.
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We have two server: Apollo and Perseo (temporary server)
Apollo has Windows 2008 and Exchange 2010
Perseo has Windows 2012 and Exchange 2016
We migrated all mailboxes from 2010 to 2016 so we can remove Exchange 2010 from Apollo, 

Is it possible to uninstall Exchange 2010 from Apollo and make a Windows 2012 upgrade in place without a format??, then install Exchange 2016 in Apollo and migrate back all mailboxes? We prefer the simple way of in place upgrade, if not, we need to spend a lot extra time moving all the roles to one server and then back to Apollo.

Inplace upgrade Windows 2008 to Windows 2012 with Exchange just unistalled.

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

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

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.