Exchange Web Services enters the final stretch before Microsoft pulls access

Microsoft begins disabling Exchange Web Services (EWS) in Exchange Online today, ahead of the API's permanent retirement on April 1, 2027. Introduced with Exchange Server 2007, EWS allows applications to access mailbox data including email, calendars, and contacts. Microsoft says the service "no longer aligns with today's security, scale, or reliability requirements" and recommends moving integrations to Microsoft Graph, although some capability gaps remain.