Upcoming changes to Exchange Web Services (EWS) API for Office 365

Currently, accessing our O365 mail accounts via EWS is dirt simple (and we have a federated, government domain and in five {5} lines of code, we bind to what we want) : $Service = [Microsoft.Exchange.WebServices.Data.ExchangeService]::new([Microsoft.Exchange.WebServices.Data.ExchangeVersion]::Exchange2013_SP1) $Service.Credentials = [System.Net.NetworkCredential]::new($UserName, $Password, $Domain) $Service.Url = "https://outlook.office365.com/EWS/Exchange.asmx" $Folderid = new-object Microsoft.Exchange.WebServices.Data.FolderId([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Tasks, $mailbox) $Folder = [Microsoft.Exchange.WebServices.Data.Folder]::Bind($Service, $Folderid) The users simply give whatever permissions they want to our service account in their native Outlook clients through their normal method of sharing, and poof - we have mail, calendar and task access - all controlled by the email user. So........are there any EXAMPLES that "translate" the dirt simple approach above into an OAUTH2 approach?