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Do i only loose the PM features like quarantine, virus scan etc and the exchange server will still receive mails and can send mails without problems? Or do i have to deinstall PM or deactivate the PM services?
In case the license is expired, the endpoint would not be able to receive virus definitions and the updates. Also features such as blocking spam emails and virus scan won't be work properly. I would recommend you to uninstall Puremessage as it might result in inappropriate behavior after a certain time for Puremessage.