Hi, I'm planning on migrating some G-Suite users to Office 365. But they already have an Office 365 mailbox with lots of content. Will the migration sync the mailboxes (i.e. delete existing content) or will it merge them?
Well, *how* are you planning to migrate them? Check the documentation of the tool you plan to use for details as to what happens to existing mailbox content, we can only guess here...
