Microsoft Corp. has been moving quietly but diligently in recent months to bolster its sales efforts in Germany’s huge public sector market where open source software, particularly the Linux operating system, is becoming increasingly popular.

Karl Aigner, the SuSE Linux AG account manager who persuaded the Munich city government to dump Microsoft in favor of Linux last year, jumped ship at the beginning of this month, joining Microsoft GmbH in Unterschleissheim, Germany, according to Microsoft spokesperson Hans-J