Steps to reproduce:

1. Install Zabbix agent 2 6.0.16 on a Windows 2019 Exchange server

Result:
zabbix_get -s exchangesrv -k system.run["powershell.exe -NoProfile -ExecutionPolicy Bypass -NonInteractive hostname"]
ZBX_NOTSUPPORTED: Cannot execute command: exec: "cmd": cannot run executable found relative to current directory

Expected:
zabbix_get -s <EXCHANGESRV> -k system.run["powershell.exe -NoProfile -ExecutionPolicy Bypass -NonInteractive hostname"]

exchangesrv