They use Windows and MS Office on desktops to this day and use Linux on servers and some FOSS tools ON WINDOWS DESKTOPS.
Citation needed.
I know for a fact that there are no official numbers, and it's estimated to be a split between the two OSes.
You claimed that Munich said "Hell no" to Microsoft Migration but here you spell it out yourself: The politicians did sell out to Microsoft and only newly elected politicians partially reversed it.
Ya, I'm not sure which part confuses you, but I'll try to help:
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Politician A sells out to MS
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Migration back to Windows begins
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Politician B gets elected
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Politician B says "hell no" (hyperbole) to Microsoft switch back
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Politician B halts the migration
Still confused? Then I can't help you.