Heh, here you go: http://mxmap.be https://mxmap.ch/ https://kommune-epost-norge.netlify.app/ for Norway and https://swedish-mail-dependency.netlify.app/ for Sweden.
replyFrance even has an official map of this kind, with publicly visible recommendations: https://suiteterritoriale.anct.gouv.fr/conformite/cartograph...
Disclaimer: I made mxmap.be after seeing Swiss ant Dutch counterparts. I did not look at MX records only but also at EHLO replies, SPF and DMARC records and at fronting services.
In Belgium, 72% of the communes are on Microsoft 365:
replyhttps://jurgen.gaeremyn.be/2025/03/08/european-critical-depe...
"Purely based on the MX-records, we learn that 72% of Belgian municipalities run Microsoft mail servers and 60% of the Dutch municipalities. For Scandinavia, it’s 64% in Norway and 57% in Sweden. In Finland, it’s a whopping 77% if the cities that are being served by Microsoft."
Running a Microsoft mail server doesn't automatically mean you are on 365. You can still host Exchange onsite
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