Since world is moving towards Cloud and away from Basic authentication, I also have to address this in my scripts. With the latest announcement on The Microsoft Exchange Team Blog about the Upcoming changes to Exchange Web Services (EWS) API for Office 365, I get a lot of questions from people about this.
First of all: This change is ONLY for Office 365!
Besides this I appreciate this change and believe it or not with the latest Exchange versions you can use OAuth already on your on-premises environment.
In this post I describe how get your tokens using ADAL, which can be used for accessing a mailbox via EWS. Most of you might already used a tool, which supports OAuth, but weren’t aware of: EWS Editor