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MC441064 | September 30 - A common request from Exchange Online admins is for the ability to customize the message expiration timeout interval for messages sent by users in their organization. When a message in Exchange Online can't be delivered or sent due to a temporary error, the message is queued for subsequent retries until either the message is delivered or sent, or until the message expires after the message expiration timeout interval has passed. In Exchange Online the service-wide default setting is 24 hours....