[Reference:http://www.esna.com/services/education/IX_Messaging_10_8/SIG/RH5_IXM_SIG/IXM_Server_Install_Guide_UC_Installation_Summary/IXM_Server_Install_Guide_UC_Installation_Summary.htm(see caution), , When deploying Avaya IX™ Messaging on Windows Server 2012 and 2016, the minimum capacity for the operating system drive should be100 GB or greater. This ensures sufficient spacefor the operating system, application files, and any necessary updates or patches. Having adequate disk space is essential for smooth operation and optimal performance of the messaging system., References: The information is based on Avaya’s official documentation and guidelines for system requirements[8]., , ]