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Thanks for the solution. &nbsp;But the issue in our case was that mails were directly being forwarded to another mailbox.
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Out of office automatic reply doesn't work for a user whose property is set to <b>Hide from Exchange address Lists</b>
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Out of office automatic reply doesn't work for a user whose property is set to Hide from Exchange address Lists

Out of Office not working

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.