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What happens if Outlook uses Outlook Anywhere? It “opens” the RPC Website. So it’s often suggested to change the settings to NTLM. Mainly Exchange 2016 uses different methods compared to 2010. All information’s that are available point to an Authentication Problem. Time to check the information’s that I had until now. First I only changed the setting on the 2010 CAS-Servers – than also on 2016. To make sure everything is applied correctly I also did an IISRESET. Now switch the setting to NetworkService.Īfter this confirm the settings with OK (twice) and press Recycle on the right side in the IIS Console (when the Default-App-Pool is selected). Open the IIS Manager on the 2010 CAS and go to Application Pools => DefaultAppPool and choose Advanced Settings on the right side. Luckily the Hotfix also describes a workaround: There was no error message nor anything else – the installation just started fine but never finished. I downloaded the hotfix – but the installation “failed”. I then found Hotfix 2990117 from Microsoft which exactly described our problem.
![merge a 2011 and.2016 outlook identity merge a 2011 and.2016 outlook identity](https://venturebeat.com/wp-content/uploads/2018/06/Farpoint_20180606222612.jpg)
Unfortunately this didn’t fix the problem So time to look for other solutions. Restart IIS to make sure the setting is applied (CMD – IISRESET): Set-OutlookAnywhere -Identity "SERVERNAME\Rpc (Default Web Site)" -ClientAuthenticationMethod ntlm Time to change the Exchange 2010 CAS to NTLM Authentication: Interestingly the Exchange 2010 Shell shows the option ClientAuthenticationMethod – while the 2016 Shell shows InternalClientAuthenticationMethod AND ExternalClientAuthenticationMethod. Ok – let’s check the current settings with PowerShell (Exchange Management Shell) for each CAS-Server: If you start to google for the problem, the first hint you get is to change the Outlook Anywhere Authentication on Exchange 2016 (the default now is Negotiate) to NTLM. The problem only happened for users that had access to public folders (still hosted on Exchange 2010) or mailboxes that also had not been migrated. Users with a Mailbox on 2016 always received a login prompt when they started Outlook.
![merge a 2011 and.2016 outlook identity merge a 2011 and.2016 outlook identity](https://venturebeat.com/wp-content/uploads/2017/12/tidal3.jpg)
During a migration from Exchange 2010 to Exchange 2016 I was facing a strange problem.
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