Move to different family of Office 365 plan

Hi,

Is there anyone out there who already moved from Office 365 Exchange Online plan to Office 365 Small Business Premium Plan ? A have a client, who would like to do this.

My understanding from the information I've got from Microsoft is that I'll have to do a migration similar On-premise -> O365.

So I wonder if there are people out there who already did this ?

Thanks, Dirk