Blog - Upcoming changes to Exchange Web Services API for Office 365

GrinMark products rely on Exchange Web Services API (EWS) to access Exchange mailbox data. For a long time we use Basic Authentication to connect to Exchange with username/password combination. Since Microsoft has plans to disable Basic Authentication for all Exchange Online tenants in the second half of 2021 and already disables Basic Authentication by default for new Exchange Online tenants since October 2020 there are certain steps you need to do to continue using GrinMark services in the future.