With the release of Exchange Server in 2007, Microsoft also introduced Exchange Web Services (EWS). These SOAP-based APIs allow developers to access Microsoft Exchange products such as calendars, contacts, etc. over the internet. As part of the Office 365 product launch, Microsoft also released the new REST-based Office 365 Unified APIs, later known as the MS Graph APIs, in 2015. Microsoft announced in 2018 that there would be no more active development for the EWS APIs. The Exchange Web Services no longer meet today's security and maintenance requirements. For this reason, the various EWS APIs will be gradually shut down from 2022 on and replaced by the MS Graph APIs. An overview of services already accessible via the MS Graph APIs can be found in the current documentation from Microsoft. Due to the switch to MS Graph, various companies have to adapt their digital products.
In this article series, we will discuss some of the lessons learned during such a transition to Microsoft Graph REST API v1.0 with the MS Graph Java SDK.