If your monitored server is no Exchange server than disable the Exchange section inside the agent.
C:\ProgramData\checkmk\agent\check_mk.user.yml
global:
disabled_sections: [msexch]
It is good practice to disable sections that are really not needed on every machine.
On most of my machines these are msexch, openhardwaremonitor, skype and mrpe (convert old scripts to local checks).
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