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Windows 2012 AD Environment<br />
<br />
In order to prep for O365, we recently change everyones UPN to match their PrimarySMTPAddress. <br />
Not changing their User Logon Name (pre-Windows 2000), that stayed the same. <br />
<br />
About 90% of the users are still able to log in using their Pre-Windows 2000 logon names and/or new UPN (email address), but there are reports coming in that many can not log in. <br />
<br />
Anyone know what I could be looking for to troubleshoot? Thinking it could be AD replication perhaps? depending what global catalog server they may be hitting? <br />
<br />
Any ideas?
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Windows 2012 AD Environment

In order to prep for O365, we recently change everyones UPN to match their PrimarySMTPAddress. 
Not changing their User Logon Name (pre-Windows 2000), that stayed the same. 

About 90% of the users are still able to log in using their Pre-Windows 2000 logon names and/or new UPN (email address), but there are reports coming in that many can not log in. 

Anyone know what I could be looking for to troubleshoot? Thinking it could be AD replication perhaps? depending what global catalog server they may be hitting? 

Any ideas?

UPNs changed, login issues

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

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Microsoft Legacy OS

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.