My goal is to get the user\'s (Office 365 and Outlook.com) meetings for a given day in a WPF C# project. Following the steps described in the Outlook Dev Center Tutorial, th
If you want to be able to get items from Outlook.com as well as O365 outlook, you should use the new v2.0 app model. You will find useful documentation here : https://azure.microsoft.com/en-us/documentation/articles/active-directory-v2-app-registration/
You should read the limitations here: http://azure.microsoft.com/documentation/articles/active-directory-v2-limitations/
While you can use any Microsoft account to register applications, not all Microsoft accounts have been enabled for the REST APIs. To request an Outlook.com developer preview account with the REST APIs enabled, send an email at outlookdev@microsoft.com
Finally if you want a sample to log in within a desktop application, check this tutorial : https://azure.microsoft.com/en-us/documentation/articles/active-directory-v2-devquickstarts-wpf/