I want to migrate my email from one hosted provider to O365 E3. Is there any way to stage this migration process?
What I am asking is, can I have accounts at both the old provider and O365? I.e. Jim has been migrated to O365 and deleted at the old hosted provider, but John is has not been migrated and is still active at the old host. Is there any way that mail will route correctly? I am sure this is just a pipe dream...