HPE and Oracle are continuing a bitter legal battle in which the former has accused the latter of helping to drive the sales collapse of Itanium chip-based systems.
Jurors are set to hear opening arguments from both companies today. HPE is seeking $3bn in damages from Oracle.
HPE alleges that Oracle, which was one of its key partners, helped Itanium-powered systems sales to plunge because its January 2010 purchase of Sun Microsystems essentially turned Oracle into an HP (now HPE) competitor.
But Oracle denies HPE's allegation, stating that the Itanium-based products didn't have the same impact for other reasons.
The animosity between the two companies heightened when Oracle offered former HP CEO Mark Hurd a job as a co-president. HP's board had controversially asked him to resign the month before.
At the time, HP filed suit against Oracle, suggesting that Hurd possessed trade secrets that would allow Oracle to compete unfairly with his former employer. The companies reached a settlement several weeks later.
Oracle said in March 2011 that it would stop creating new versions of its database and other software for Itanium-based systems. It claimed that Intel, which worked with HP to create Itanium, had made clear that Itanium was nearing the end of its life.
Intel and HP hit back, stating that they remained committed to Itanium. HP sued Oracle in June 2011, stating that as part of the settlement it had reached in 2011, it should have kept supporting Itanium as it had been.
HP claimed that Oracle instead "exhorted its salesforce to strike at HP's base of Itanium customers to try to switch them to Oracle's Sun platform".
A judge ruled in favour of HP in August 2012, saying that the 2010 settlement had obliged Oracle to keep developing Itanium versions of its products for free as long as HP sold such systems.
The current case will look at whether either company violated the agreement and any damages that are owed as a result. The trial is expected to last about five weeks.
Google beat Oracle last week in a court case over the use of 37 Java APIs in the Android operating system.
Users are told that their non-existent 'iPhoneID' is expiring soon
Expansion of SDK intended to expand Amazon Alexa ecosystem
Locky returns from a prolonged rest with two new variants
AMD lambasted over Radeon RX Vega pricing that will add an extra £100 to RX Vega 56 and 64 graphics cards
Company accused of failing to tell anyone that the launch prices were only introductory offers