Microsoft’s EWS shutdown should be treated as a warning, not a one-off
On 1st October, Microsoft will begin disabling its Exchange Web Services (EWS) API, ahead of a full shutdown in April 2027. For many organizations, EWS has long been part of the invisible plumbing behind everyday workplace tools. It allows applications to connect to Exchange mailboxes, making it possible to access and manage data from emails, calendars, contacts and folders.
Global Field CTO at Boomi.
But EWS is almost 20 years old. Microsoft says it no longer aligns with modern requirements for security, scale and reliability, and its involvement in 2024’s Midnight Blizzard attack has added urgency to its retirement. The wider risk is also clear: APIs, particularly older and less visible ones, have become attractive targets for cybercriminals. Recent research found that 99% of organizations encountered API security issues in the past year.
Seen in that context, Microsoft’s decision to move customers towards more modern APIs such as...
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