Several comments mention "läuft wie geschmiert" which can be translated as mobbed-up / bribed.
There's also Occam's razor: less than 2% of people choose Linux on the desktop. Maybe it's just not that good for this purpose.
Linux advocacy has also changed. It's now so entrenched on the server that the quest to get it on desktops is less relevant. A lot of the OSS advocacy was also aimed at proprietary formats, and the web (mostly google docs) has increased competition for MS Office more than OpenOffice ever dreamt of.
The one where I am productive and don't expose my data to third parties like Google.
Accenture will get you the answers Microsoft needs regardless of your situation. You can count on it.
It's arguably a much bigger threat than home users switching since businesses could switch many thousands of machines at once
To be fair, the headquarters were in Unterschleißheim before, a suburb of Munich just 5kms from the new location.
Attention Governments: Go deploy Linux on your desktops and Microsoft will appear tendering huge sacks of cash. Tell your friends. Don't let them leave with a dime.
"At the time the report was released, the FSFE questioned why Accenture was commissioned to co-author a report assessing the use of Microsoft software, when the consultancy runs a joint venture with Microsoft called Avanade, which helps businesses implement Microsoft technologies. For its part, Accenture said it has an "independent view of the technology landscape".
"At the time Munich began the move to LiMux in 2004 it was one of the largest organizations to reject Windows, and Microsoft took the city's leaving so seriously that then CEO Steve Ballmer flew to Munich to meet the mayor. More recently, Microsoft last year moved its German company headquarters to Munich."
Everything else that is written there points towards it making no sense to switch back to Windows.