How's this for ironic: The new HP Public Cloud will promote MySQL databases as a service, essentially leveraging Oracle's software to compete with the Microsoft SQL Azure cloud, among other public cloud database services.

HP (NYSE: HPQ) and Oracle (NASDAQ: ORCL) have been locked in a nasty feud ever since Oracle hired former HP CEO Mark Hurd as president. The HP vs. Oracle feud escalated when Oracle dropped software development for Itanium, the high-end processor from HP and Intel. On the flip side, HP is a long-time Microsoft (NASDAQ: MSFT) partner, deploying Windows Server, SQL Server and Exchange Server across thousands of customer settings.