Claudio Sciarpelletti had been charged with aiding and abetting Pope Benedict XVI's butler in the leaking of confidential papers.
But the court decided Sciarpelletti was guilty only of obstruction of justice because he had changed his version of events several times during the investigation.
The disgraced former butler, Paolo Gabriele, was last month sentenced to 18 months in prison for the embarrassing leaks, which were published by an Italian journalist.
They revealed infighting at the top of the Catholic Church and allegations of fraud.
More top news
A report into the care of people with learning disabilities has called for "immediate action" to protect patients.
A high number of people are fed-up with getting cold calls and want the government to do more to stop them.
The number of violent homophobic crimes have increased in the UK this year, according to new figures.