I have tried to test out outlook once I have run Config365. I have done a cutover migration and everyone has synced. I would just like to test my Outlook just to make sure that all I need to run is Config365 and then I will magically be able to use Office 365 with Exchange online.
Is there anything else I need to do ? as I could do without losing mailboxes for 100 staff.
You have one step missing after you're done with the cutover migration.
You need to start pointing your clients to the cloud mailbox instead of the local Exchange.
Here's a good summary for that: Local DNS after Office 365 migration
So configure those and if you were unable to connect for any reason to the mailbox online, roll-back your steps and you will get connectivity local Exchange again.
