Why do we need to keep an Exchange Server on-premises when we move to the cloud?

Do you need to do keep an Exchange Server on-premises when you are finished moving your mailboxes to the cloud?

Do you need to do keep an Exchange Server on-premises when you are finished moving your mailboxes to the cloud? Get the answers in this session, everything you need to know about running Exchange Hybrid.

I am an experienced speaker, delivering sessions on previous NICConf (2014,2015,2016), Microsoft TechSummit and User Groups.