Hello, Really awesome detailed instruction! Thank you for filling the gaps from Microsoft's instruction! Quick question regarding the "Provision Users in O365" step, if you don't mind: What would you do for existing O365 users? I tried to follow the steps to create Mail Users for existing user but it won't take it. I then tried to add the SMTP address (xxx@gsuite.domain.com) manually, but it wont allow me to save either. Thanks!
Bin, For existing users this migration type won't work.I would suggest you to go with simple IMAP or PST approach for existing users.