troubleshooting Question

Exchange 2016 - Office 365 Hybrid - potential problems?

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CocosDad asked on
Microsoft OfficeExchangeMicrosoft 365OneDriveDNS
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Current Environment:
Exchange 2016 on-premise
Azure AD Connect / SSO working with minimum problems for over a half year.
Approx. 50 users with the usual assortment of computers that either work in the facility or remotely via VPN. Approx. another 60 users in the field that only have phones connected to the On-Premise Exchange via ActiveSync.

We are gradually moving the personal files of the 50 office users to OneDrive for Business and implementing Teams, OneNote etc.  The Exchange 2016 will be migrated to Office 365 but has been put on hold until after this national emergency.

The CEO wants everyone to have a copy of Teams running on all of their devices in case there is a a complete lockdown. This is also the only way of having company wide meetings. All 50 users now have a Office 365 E3 license and Teams installed. Then we discovered that not all of the users had the Calendar tab on the Teams menu. We tried implementing some of the suggestions found on the Internet with no success. Microsoft Tech Support says that we need to implement a Hybrid system.

Since Azure AD Connect is running, it appears that setting up a Hybrid system is a matter of running the Hybrid configuration Wizard. We will not be migrating the mailboxes to Exchange On-line; the Exchange 2016 server will still be handling all inbound and outbound email; no changes are being made to the DNS MX records.

Two questions:

What are the repercussions of setting up the Hybrid System without migrating?

If things go bad, can I disable it?
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