The MDC, which is led by Prime Minister Morgan Tsvangirai, said it welcomed Monday’s decision by the Supreme Court in Harare to grant Mukoko "a permanent stay of prosecution on charges that were trumped up for political purposes".
The party said the ruling was a victory for democracy and a "triumph of justice".
Mukoko and eight others who were on bail were finally freed after months of incarceration, torture and harassment.
The ruling to free Mukoko by Chief Justice Godfrey Chidyau-siku will bear on the cases of other activists still facing charges.
MDC treasurer Roy Bennett, who has been designated deputy minister of agriculture, is expected to go on trial for banditry and terrorism next month.
All indications are that Bennett will be acquitted.