Fujitsu software bugs that helped send innocent postal employees to prison in the UK were known "right from the very start of deployment," a Fujitsu executive told a public inquiry today.

"All the bugs and errors have been known at one level or not, for many, many years. Right from the very start of deployment of the system, there were bugs and errors and defects, which were well-known to all parties," said Paul Patterson, co-CEO of Fujitsu's European division.

That goes back to 1999, when the Horizon software system was installed in post offices by Fujitsu subsidiary International Computers Limited. From 1999 to 2015, Fujitsu's faulty accounting software aided in the prosecution and conviction of more than 900 sub-postmasters and postmistresses who were accused of theft or fraud when the software wrongly made it appear that money was missing from their branches.

Some innocent people went to prison, while others were forced to make payments to the UK Post Office to cover the supposed shortfalls. So far, "only 93 convictions have been overturned and thousands of people are still waiting for compensation settlements," a BBC report said. //

A Financial Times article said that the public inquiry "heard in December last year that the Post Office's lawyers had rewritten Fujitsu witness statements."

The FT article also said the Post Office, which used prosecution powers available to private corporations in the UK, obtained 700 of the 900 convictions. The other convictions came in cases brought by Scottish prosecutors. The scandal may lead to reforms of the private prosecution system that lets organizations take people to court.