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Rigs33's avatar
Rigs33
Copper Contributor
Apr 07, 2020
Solved

Teams Calendar Button missing - exchange 2010 + Exchange 2016 hybrid on-prem

Hello Tech community,

 

As you can see in the object, I have one Exchange 2010 sp3 RU22 and one Exchange 2016 CU12  (same forest).

The 2016 is my hybrid server, all mailboxes are hosted on Exchange 2010 db.

My hybrid seems to be well configured, no error messages at the end of the HCW, Oauth is working as expected too, I properly migrated test mailboxes.

 

My question is, in this scenario, is that possible to leave mailboxes on Exchange 2010 db and have the calendar button appears in Teams ?
Moreover, I tried to move a mailbox from 2010 db to 2016 db, and the calendar button is still missing.

I receive the following error in Teams logs:

"2020-04-07T09:39:48.138Z Inf UserAppsStore: Skipped calendar app with isFirstParty as true. isMailboxDiscoverable: false"

 

Thanks for your help

 

 

microsoft teams
  • Rigs33's avatar
    Rigs33
    Jul 14, 2020

    Hello fishizza,

     

    I had a long troubleshoot session with a Microsoft Exchange Escalation Engineer, it appears that the Teams Rest/API protocol  is not compatible with mailboxes created in Exchange prior to 2016 CU3.
    Finally, we migrated mailboxes directly to Office 365.

     

     

  • jcgonzalezmartin's avatar
    jcgonzalezmartin
    MVP
    Apr 07, 2020
    I think the scenario you have over the table is not supported and you might need to migrate your mailboxes from Exchange 2010 to Exchange 2016
    • Rigs33's avatar
      Rigs33
      Copper Contributor
      Apr 07, 2020

      Thank you for replying jcgonzalezmartin 

       

      None of the Microsoft article states clearly that Exchange 2016 cu3 + lower Exchange version are not supported for Teams calendar button. For exemple  the Teams/Exchange interaction article says:

       

      Users with mailboxes hosted on-premises must be synchronized to Azure Active Directory. They can make use of all the features in the above scenario, but additionally they can also change the user profile picture (if the Outlook on the web mailbox policy allows them to do so), and manage meetings, providing Exchange Server 2016 (Cumulative Update 3), or later, is running on-premises.

       

      And I tried with an exchange 2016 hosted mailbox, the issue is similar.

      I opened a Ticket, I will see what Microsoft says about this config

      • fatshark_2k's avatar
        fatshark_2k
        Brass Contributor
        Apr 24, 2020

        Rigs33 curious if you have any more information about if the calendar app will be available is you have EX2010 + EX2016hybrid and switch CAS to EX2016 but still mbx reside on EX2010 ?

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