But retired ambassador Aydin Sefa Akay, a top judge attached to the UN's Mechanism for International Criminal Tribunals, was released under judicial supervision pending confirmation of the verdict by Turkey's top appeals court.
Akay was charged with "membership in an armed terror group" over alleged links to the organisation of Fethullah Gulen, the US-based preacher blamed by Ankara for the attempted overthrow of President Recep Tayyip Erdogan.
The court found Akay guilty of using Bylock, a special communication service which Ankara claims was especially created for Gulen supporters, the Dogan news agency said.
The judge was sentenced by an Ankara court to seven years and six months in jail.
He was released pending the ruling from the supreme appeals court -- the Yargitay -- a date for which has not been set. If the verdict is confirmed by the higher court, he will go back to jail.
The court also placed an overseas travel ban on Akay, Dogan reported, meaning there is no prospect of him resuming his work with the UN courts system.
Akay, one of the highest-profile suspects arrested in the post-coup crackdown, was detained in September at the family home and had been held in jail since.
In his initial testimony, Akay had admitted downloading Bylock but said he had not used any password to access the system.
Akay had been working with the UN international court trying suspects over the 1994 genocide in Rwanda and his detention has paralysed proceedings into an appeal hearing of former Rwandan minister Augustin Ngirabatware.
Under a state of emergency imposed after the coup, Turkey has embarked on a relentless crackdown against alleged supporters of Gulen, arresting tens of thousands of people.
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