Forum Discussion

Eric Adler's avatar
Eric Adler
Iron Contributor
Mar 27, 2017

SharePoint Calendar Integration with Outlook

Has there been a change in regards to using Outlook to view/interact with SharePoint (O365) calendars?   All of our users are seeing 401's regardless of site permissions (Member to Site Collection ...
SharePoint Online
jcgonzalezmartin's avatar
jcgonzalezmartin
MVP
Mar 27, 2017
SPO calendars synchronized to Outlook do nothing to see what EXO calendars so that's not the cause of your issue. AFAIK, there have not been changes in regards of synchronizing SPO calendars in Outlook
Eric Adler's avatar
Eric Adler
Iron Contributor
Mar 30, 2017
Ok, odd. We are seeing 401's across the board. Hmm...

Any troubleshooting suggestions?
  • David Lauters's avatar
    David Lauters
    Copper Contributor
    May 12, 2017

    Hi Eric, 

     

    Were you able to resolve?

     

    What version of Outlook are you running?  Is it Office 2013 by chance?

     

    We're seeing the same issue with Outlook 2013 connecting to SPOnline calendars.  We also had issues with Word/Excel/OneNote accessing documents in SPOnline.  Users would receive a login prompt that they could not get past.

     

    However this was resolved by enabling modern authentication.

    • Sleetish's avatar
      Sleetish
      Copper Contributor
      Jan 10, 2019

      For anybody else that happens to run into the 2013 -> SharePoint Online issue, these files must be updated to this minimum version for ADAL to work:

       

      File name

      Install path on your computer

      Where to get the update

      Version

      MSO.DLL

      C:\Program Files\Common Files\Microsoft Shared\OFFICE15\MSO.DLL

      https://protect-us.mimecast.com/s/9kyICPNJWNSPooDli072SE?domain=support.microsoft.com

      15.0.4753.1001

      CSI.DLL

      C:\Program Files\Common Files\Microsoft Shared\OFFICE15\Csi.dll

      https://protect-us.mimecast.com/s/1ugbCQWLgWfY33DxfMedCI?domain=support.microsoft.com

      15.0.4753.1000

      Groove.exe

      C:\Program Files\Microsoft Office\Office15\GROOVE.EXE

      https://protect-us.mimecast.com/s/CoiuCR6Bj6HxRRKVsOe5V7?domain=support.microsoft.com

      15.0.4763.1000

      Outlook.exe

      C:\Program Files\Microsoft Office\Office15\OUTLOOK.EXE

      https://protect-us.mimecast.com/s/WEvECVOZnOTY554vfQBJ07?domain=support.microsoft.com

      15.0.4753.1002

      ADAL.DLL

      C:\Program Files\Common Files\Microsoft Shared\OFFICE15\ADAL.DLL

      https://protect-us.mimecast.com/s/G1IqCW6Bo6HVPPpkupp8Ge?domain=support.microsoft.com

      1.0.2016.624

      Iexplore.exe

      C:\Program Files\Internet Explorer

      https://protect-us.mimecast.com/s/kei3CXDVpDfWqq6JC7HmHI?domain=support.microsoft.com

      Not applicable

       

      It's mentioned as part of the MFA requirements, but I haven't seen it mentioned anywhere as part of the ADAL requirements or as a solution to the Office 2013 credential prompting issue that you'll find yourself running into if you don't have a completely up-to-date 2013 MSI install.

       

      I'd also recommend clearing the HKCU\Software\Microsoft\Office\15.0\Common\Identity key and Identities subkey, and adding back EnableADAL and Version as DWORDs with a value of 1 to enable ADAL.

       

      If there's not a GUID_ADAL key under HKCU\Software\Microsoft\Office\15.0\Common\Identity\Identities after you make an Office->SharePoint connection, then it's not working and ADAL isn't being used.

       

      Hopefully this is helpful to someone else so they don't have to track down the problem.

    • David Lauters's avatar
      David Lauters
      Copper Contributor
      May 12, 2017
      Oops sorry I just re-read your post and see you mentioned it was Outlook 2016.

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