Currently I am working with a customer who want to move their email hosting from Exchange 2016 to Office 365. I was wondering if it is possible to have two MX records while the migration is going on. I want to setup the Office 365 environment up first before migrating mailboxes The Exchange 2016 provider host multiple domains so a hybrid version is not really an option. I am wondering what is the best way to achieve this migration. Thanks in advance.