IDC confirms the expansion of OSS in EU
There were two thought-provoking findings in a recent IDC report based on a survey conducted on 625 western European companies. The first one is that open source software is eating into the market share of proprietary software products and gaining ground in mid-to-large sized companies in Europe. The second one is that these companies perceive software to be very important for their ability to succeed and compete.
If you combine the two findings you conclude that open source is becoming mature enough for these companies to trust it and use it to build software that is a key component of their success. The study talks specifically about database open source.
Some European countries are even are moving to legislate preferences for open source over proprietary software. The proposals range in strength from mild boosts to complete mandates.
Note that most of these stories are limited to infrastructure software (operating system and database).