"As Mary Jo Foley reported recently, Microsoft is arguing that Oracle shouldn't be allowed to buy Sun. According to my sources, the reason why Microsoft wants to block the deal has nothing to do with MySQL remaining open source. It's all about making sure Oracle can't use MySQL as a low-cost alternative to SQL Server on the low end.
"Microsoft's only toehold in serious DBMS work is in the SMB (small-to-medium business) space. Open source or not, a low-price MySQL with Oracle branding could boot Microsoft out of this line. They really, really don't want to see that."