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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 Exchang...
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.

     

     

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 ?

  • Rigs33's avatar
    Rigs33
    Copper Contributor
    Apr 28, 2020
    CAS and mbx still resides on EX2010, the case has been escalated to Microsoft on-prem experts.
    I'm waitng for their feedback.
    FYI, if i create a mbx directly on 2016 db, the calendar button appears in teams.
    If I move a mbx from 2010 db to 2016 db, the calendar button is missing.
    • fatshark_2k's avatar
      fatshark_2k
      Brass Contributor
      Apr 29, 2020
      @riggs33 i just tested today myself. Mbx on 2016 has the calendar app in teams. Mbx on 2010 does not have a calendar app in teams. So mailbox should be on ex16 as requirement.
      • Rigs33's avatar
        Rigs33
        Copper Contributor
        Apr 29, 2020

        fatshark_2k As I mentioned in a previous post, according to this https://docs.microsoft.com/en-us/microsoftteams/exchange-teams-interact,  the requirement are:

        - sync running

        - Oauth configured properly

        - At least, Exchange 2016 cu3

        But nothing states clearly that the mailboxes have to reside on Exchange 2016 in a multi exchange environnement.

        And again, if I move a mailbox from 2010 db to 2016 db, the issue persist..... Whereas if I create a mailbox directly on 2016 db, we have the expected behaviour with Teams calendar.

         

        On your side, did you try to move a mailbox from ex2010 to ex2016, and see if the calendar  is showing up in Teams ?

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