On 30 March 2015, HP filed a claim against Dr Lynch for allegedly engaging in improper transactions and accounting practices. Dr Lynch, in turn, issued a counterclaim against HP related to the significant reputational damage he has suffered following his departure from Autonomy.
The trial commenced on 25 March 2019 in London’s High Court and concluded on 15 January 2020.
In March 2020, Bloomberg journalist Jonathan Browning summarised the High Court proceedings in an in-depth article that details evidence heard over the course of the 10 month trial.
| Length of trial | 93 days over 10 months |
| Number of witnesses | 58 |
| Length of MRL’s questioning | 22 days in the witness box over six weeks — the longest cross-examination of the last 25 years (and one of the longest ever in British legal history) |
| Length of Opening Submissions (total for all parties) | 1,067 pages |
| Length of Closing Submissions (total for all parties) | 4,494 pages |
| Number of documents in the corpus | 11.3 million |
| Number of lawyers | 30+ |
| Number of barristers | 14, of which 4 are leading QCs |
| Costs (estimated) | £40+ million |