Have you upgraded to Windows 10 and noticed that your Outlook is no longer finding the proper settings to connect to your Office 365 email? Does your configuration just hang on the “Searching for mail server settings…” screen?

Autodiscover

I ran into this issue recently and discovered that there’s a known issue with Windows 10 and autodiscover in Office versions 2010 and later. After working with Microsoft support to get this resolved, they mentioned that they are aware of this issue and hope to have it resolved in future patches but until then, the support tech provided me with the following workarounds:

NOTE – 2 of these workarounds require modifying the registry. As always, it’s best to create a backup of your registry prior to making any changes. You have been warned.

Workaround #1

Set the ExcludeHttpsRootDomain registry key on all affected clients to a value of 1.

  1. Open the registry editor
    • Click the start menu and type regeditregedit
  2. Navigate to HKEY_CURRENT_USERSoftwareMicrosoftOfficex.0OutlookAutoDiscover
    • Note – x.0 corresponds to your installed version of Office: Office 2013=15.0, Office 2016=16.0
  3. Change the DWORD: ExcludeHttpsRootDomain to Value: 1
    • If the DWORD doesn’t exist, create it.ExcludeHttpsRootDomain
  4. Close the registry editor and launch Outlook. Reconfigure the profile.

Ref: https://support.microsoft.com/en-us/kb/2212902

Workaround #2

Disable MSOAuth, registry key:

  1. Open the registry editor (see Workaround #1 for instructions to do this)
  2. Navigate to HKEY_CURRENT_USERSOFTWAREMicrosoftExchange
  3. Change the DWORD: MsoAuthDisabled to Value: 1
    • If the DWORD doesn’t exist, create it.MSOAuthDisabled
  4. Close the registry editor and launch Outlook. Reconfigure the profile.

Ref: https://support.microsoft.com/en-us/kb/3083832

Workaround #3

Revert Outlook 2013 to the May 2015 Public Update version 15.0.4719.1002. This issue appears to have been introduced in the June Public Update.

For Click-to-Run use the steps in this KB to revert Outlook to the May PU, https://support.microsoft.com/en-us/kb/2770432