EXCHANGE Hybrid woes with shared calendars

[neonetman]

Good morning all,

 

The saga of our hybrid setup continues. We currently have a number of our staff on O365, whilst others remain on premises Exchange. We've now realised that our O365 users can't see the shared room calendars on the on-prem server. Is there a way of ensuring that all users (both on-prem and O365) can see all shared resource calendars?

 

Cheers for any guidance

[chaplic]

This can and does work, but there's about a billion things that can go wrong.

 

 

https://techcommunity.microsoft.com/legacyfs/online/media/2019/01/FB_Errors.FixesV6.pdf

 

Is a good a guide as you'll get and I've solved several free/busy issues with it.

 

 

testing via webmail with F12 console up is usually very enlightening.

[3s-gtech]

Your Exchange server will need certs for its external address and also its autodiscover address. You may need licenses for Exchange Online for users even without a O365 mailbox. As above - there are so many things that can cause it - we had calendar issues in Teams due to missing certificates on some addresses so I spent a bit on a fancy cert from Comodo (though this can be done with Let’s Encrypt, it was doing my nut in as I had to intervene every two months).

[neonetman]

How would I go about migrating the room mailboxes from Exchange 2016 to O365 - whilst I can see migration options for user mailboxes, I don't seem to be able to find an option for room mailboxes?