The Capture system was used in branches between 1992 and 1999 – before the flawed Horizon software was brought into branches.
A report earlier this year found there was a “reasonable likelihood” it created cash shortfalls – for which workers were blamed.
Seema Misra from West Byfleet was sent to jail in 2010 while she was 8 weeks pregnant and gave birth while on a tag.
Post Office minister Gareth Thomas says any convictions could be reviewed.
