When any new company subscribe the office 365 their IDs are created on the Microsoft Azure Directory Service and their
mailboxes etc on the cloud
Any Existing Company that is having infrastructure of AD, Exchange can move to office 365 using hybrid Deployment
(coexistance ) in which we deploy Directory Sync Server which replicates Users and their Passwords to Microsoft Azure
Directory service , but now changes can be made in user accounts from local Premises AD only i.e. one way replication only
Q: After migrating All Mailboxes to cloud now if the company wants to remove the Directory Sync Server and DC too and want
to make any future changes in User's password etc from the Cloud how can this be acheived?