Connection issues with Outlook and Exchange on-premise – this is how you can fix it.

Some days ago I saw some curious issues on current Microsoft Windows 10 installations with Outlook 2016 home and business.

They asked for a „password“. But in a special way, by a Microsoft tanent.

I had never seen this before. So i started to debug the problem.

The condition for this Outlook issue is:

Outlook Anmeldeproblem an einem on-premise Exchange (also nicht Office365)

• Windows (10 Pro) with Outlook 2016 Home and Business (maybe other versions are also affected)
• When your outlook is asking you for credentials that you do not know on a „special/new“ popup, sometimes with a Microsoft logo or your own company logo
• it may started with the last Office Update (March 10th.2020 – Version 1808 (Build 10357.20081))
  • with this update the regular autodiscover seems to be obsolete and not be working anymore as expected.
  • you can prevent that issue with the following instruction

• close your local outlook application
• start Powershell within your current user
• copy and paste the following command/regedit

reg add "HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover" /v ExcludeExplicitO365Endpoint /t REG_DWORD /d 0001

• close Powershell
• add a new profile for your Outlook application. Go to System Preferences „Mail (Microsoft Outlook 2016)“ and enter your credentials to add a your new (existing) account
• Start Outlook

After you did these steps, your Outlook should work again.
Make sure that you have every Windows and Office updates installed at this point!
You also have to make sure, that your admins has set up your compandy DNS correct.

dig srv _autodiscover._tcp.domain.tld
_autodiscover._tcp.domain.tld. 180 IN SRV 0 0 443 yourExchangeServer.domain.tld.

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