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In a standard installation, our ROOMZ Server is able to work with Extended protection. (Tested with Exchange 2019 CU14), if . If you have experience issues with extended protection, you may please have a look on the following set-upsMicrosoft documentation: https://learn.microsoft.com/en-us/exchange/plan-and-deploy/post-installation-tasks/security-best-practices/exchange-extended-protection?view=exchserver-2019#scenarios-that-could-affect-client-connectivity-when-extended-protection-was-enabled
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