Hello Andreas;
Thank you for your quick reply, it helped a lot in troubleshooting this issue.
I found a legacy file (my other servers which I set up after the 1.5 era don’t have that file) on my system called /opt/omd/sites/OER/var/check_mk/core/config.mk which contains the following:
...
winperf_msx_queues = {'Retry Remote Delivery': '4', 'Active Remote Delivery': '2', 'Poison Queue Length': '44', 'Active Mailbox Delivery': '6'}
...
I moved the file so it does not mess with my checks. I also created the same rule as you did, there are no other rules of the type “MS Exchange Message Queues Discovery” defined:
After doing a full discovery the checks stay the same, but the parameters no longer show the “Invalid check parameter”-error (I mentioned this in my first post). But the offset stays the same and other no other queues are found:
Funny thing is, this happens only on one of my systems. I have other Checkmk Servers in other locations where the configuration works just fine.
Are there maybe some other files messing with my checks? Any guesses?