Hi Menno Demandt,
Have a Good day.
Regarding your question about if rule created from outlook on the web OWA,
Does it will work on outlook desktop or not?
Yes, will work normally please check below our test scenario.
We created rule from OWA move emails contain (onmicrosoft) to archive folder.
Figure1
And Per attached screenshots Figure2&3 it’s working well on both Classic and new outlook for windows.
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Thanks in advance and have a great day.
Best regards
Community Moderator