Ensure that you are on a version of CXN that supports the O365 release you are on. There have been some changes on the Microsoft side recently so this is worth verifying.
If you haven't already, configure your UM Service on CUC to "Search for Exchange Servers." This should cause Auto Discover to be used to find a CAS server appropriate to that user.
You need to test this with your on-premise Exchange environment first. There are ripple effects to HTTP vs. HTTPS, both for the Auto Discovery piece itself and the resulting EWS URLs that it returns for all of the CAS servers. This can take time to clean up!
Have a user mailbox that is already integrated with CUC ported to O365.
Does the Auto Discover result update to show an O365 CAS server?
If this is done correctly, you shouldn't have to touch individual CUC mailboxes as the Exchange team moves people over. Another way to go about this is to create a separate UM Service and the use BAT to update which UM Service a mailbox is associated to.
You mentioned using the BAT..."Another way to go about this is to create a separate UM Service and the use BAT to update which UM Service a mailbox is associated to."
How does this work? When I export the users with mailboxes there is no header indicating the service that is being used whether Exchange or O365. I am currently manually changing over all the users. Being able to use BAT would be great.
Microsoft Cloud are capturing almost entire market share in comparison to on-premises client-server architecture. And many companies are migrating from Exchange to Office 365 although are some manual approaches for migration but that requires to set pre-requisite. Thus the better way to migrate Exchange to Office 365 is by using quality migration app. Move all emails, contacts, tasks to Office 365 with attached data and all. The application offers to migrate data in bulk with no limitations.
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