Well, the City of Munich has briefly answered to this study which microsoft has not made public and hence is difficult for the city to make concrete statements

Well, the City of Munich has briefly answered to this study which microsoft has not made public and hence is difficult for the city to make concrete statements about: (GERMAN) http://www.muenchen.info/pia/RSS/015.pdf http://www.muenchen.info/pia/RSS/015.pdf [page 8] Summary: They comment that the study did not incorporate costs for licensing the microsoft products, which would have cost additional 7 million Euros. The city comment that it would not have been possible to keep the Microsoft products without upgrading to newer versions as stated otherwise in the study, because microsoft at the time of decision announced to discontinue the product-line of Windows-NT. They also deny the statement that the LiMux-client is 10 years old and hence outdated. The LiMux-Client has undergone many improvements and upgrades over the past years and can today stand a direct comparison with Windows 7. Also they say that not only 75%, but 87% (13000 out of 15000) of the workstations are running the Linux-Client as of today. The statement of the study that all of the specialized processes cannot be migrated to Linux is also wrong, but it is true that not all of those processes can be migrated.