Glen's Exchange and Office 365 Dev Blog

With the latest updates that have been released recently for Compose apps that are now available in OWA in Office365 and the Office/Exchange 16 preview the ability to extend what your compose apps can do has been greatly enhanced. With version 1.3 of the API you can now save an Item via the saveAsync method https://msdn.microsoft.com/en-us/library/office/mt269096.aspx  . Why this small change is important from an extensibility point of view is that when you save an Item this way, it creates a draft in the Mailbox you activated the compose app from which you can then modify anyway you like using the EWS updateItem operation. (normally you would be restricted in a compose app to just using the subset of properties and methods provided for in the Office.js). One trick however is the ItemId which you need to make an UpdateItem EWS Request to update the Draft Item is still only available in Read Mode. So to get around this I've come up with t...