Environment: Office 365 Education - Hybrid Exchange and AD
We have recently migrated one of our key admin assistants to Exchange Online. A process she has always undertaken now appears to fail. (Noted: it's not the greatest process!!)
She copies and pastes ~600 email adresses into her new Message BCC Field (Outlook 2016 desktop client) and sends it (To:) to herself.
It used to work when she was on-prem - it now fails.
I have read in other forums that there are limits set on O365 Online mailboxes for different licenses. can anyone here confirm?