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Teams & mixed Exchange 2013 / 2016

O365 Admin 1 Reputation point
2020-08-10T14:35:01.433+00:00

Hello,

we have an 2 node Exchange 2013 DAG Cluster (latest CU) and are testing Exchange Hybrid & Teams.

As far as i know Teams can't access the Exchange 2013 onprem calendars because of missing REST API and autodiscoverV2.

My question: Would an third Exchange server in version 2016 fix this problem? So the 2016 Exchange gets the external CAS Requests and proxy to the mailboxes on the 2013 DAG Cluster?

Thankyou in advance & kind regards Boris

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  1. Andy David - MVP 144.1K Reputation points MVP
    2020-08-10T14:46:57.247+00:00

    Unfortunately, no
    The mailboxes have to be in Exchange 2016 CU3 and above databases

    https://techcommunity.microsoft.com/t5/exchange-team-blog/configuring-teams-calendar-access-for-exchange-on-premises/ba-p/1484009

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  2. Jon Alfred Smith 541 Reputation points
    2020-08-10T14:52:27.017+00:00

    I have never tried this. But according to this article written by the Exchange Team (and several blogs), on-premises mailboxes should be on Exchange 2016 CU3 or higher.
    https://techcommunity.microsoft.com/t5/exchange-team-blog/configuring-teams-calendar-access-for-exchange-on-premises/ba-p/1484009

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  3. Joyce Shen - MSFT 16,646 Reputation points
    2020-08-14T08:12:06.18+00:00

    As suggested above, you will need to upgrade your Exchange 2013 to 2016, migrate the mailboxes to the new server then configure it again.

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