The open letter was just the latest move by Lynch in response to HP's allegations, as he has granted a number of media interviews on the subject.
In a statement released Tuesday, HP declined to address Lynch's questions.
"While Dr. Lynch is eager for a debate, we believe the legal process is the correct method in which to bring out the facts and take action on behalf of our shareholders," it stated. "In that setting, we look forward to hearing Dr. Lynch and other former Autonomy employees answer questions under penalty of perjury."
"The matter is in the hands of the authorities, including the UK Serious Fraud Office, the US Securities and Exchange Commission's Enforcement Division and the US Department of Justice, and we will defer to them as to how they wish to engage with Dr. Lynch," it added. "In addition, HP will take legal action against the parties involved at the appropriate time."
Chris Kanaracus covers enterprise software and general technology breaking news for The IDG News Service. Chris' email address is Chris_Kanaracus@idg.com