For the full Microsoft Teams experience, every user should be enabled
for Exchange Online and SharePoint Online. Users' Exchange mailboxes can
be hosted online or on-premises. Users with Exchange mailboxes
on-premises will not be able to configure connectors, but can still
receive messages from connectors configured by other users.
I had a customer report when a mailbox is homed on-premises, the Meetings button in the Teams client is hidden but avaialble in the webclient. Is that accurate?
If so, is there any speicifc user experience documented in that scenario? We've certainly relayed that the best experience will be using an EXO mailbox but they want to begin piloting teams prior to the mailbox migration to O365.