I am trying to figure out if Trend Micro Office Scan is an authorized AV solution for these servers? I do not see where antivirus solutions are listed anywhere?
Unity Supported Virus-Scanning Software
ScanMail for Lotus Notes, version 2.5 and later.
ScanMail for Microsoft Exchange 2000, version 5 and later.
ScanMail for Microsoft Exchange 5.5, version 3.x and later.
ServerProtect for Microsoft Windows, version 5.5 and later.