Please note that from 10.10.2023, IceWarp is ending technical support for its solution running on Windows Server 2012 that reached its life cycle defined by Microsoft.
See the announcement from Microsoft:
Windows Server 2012 and 2012 R2 reaching end of support
Windows Server 2012 and Windows Server 2012 R2 will end on October 10, 2023. After this date, these products will no longer receive security updates, non-security updates, bug fixes, technical support, or online technical content updates. If you cannot upgrade to the next version, you will need to use Extended Security Updates (ESUs) for up to three years. ESUs are available for free in Azure or need to be purchased for on-premises deployments. Microsoft has guidance for both cloud and on-premises solutions. Go here to learn more.