We’re about a month away from the deadline we communicated in our blog post and Message Center posts, and we want to remind our customers before we start blocking traffic.
The preview program for REST API access to on-premises mailboxes in an Exchange hybrid configuration has ended. Beginning June 2023, we will return errors for requests made against on-premises mailboxes.
Over the past few weeks, we have sent Message Center (MC) posts to the affected customers; we encourage you to check your Message Center for posts MC541164 and MC541165. If you have received those messages, you have some apps that might be affected; if you don’t have the messages, this change will not affect your tenant.
Read full article (Microsoft Exchange Blog)
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