"There are serious indications that a considerable number of postal votes were falsified, not for the benefit of one candidate, but to prejudice it and to put a question mark over this form of voting," the judge said in the ruling.
"There are signs that numerous people were involved in one form or another in the various plots for the collection and falsification of the postal votes."
Calderon was elected president by a narrow 246 majority after a controversial and bitter campaign in 2006, when the postal vote was not included in the count.
Calderon and another candidate, Arturo Baldasano, managed to obtain a court ruling suspending the postal vote two days before the election, on the basis that that there were insufficient controls to guarantee their legitimacy.
After almost eight months of controversy the postal vote was finally nullified.
"I have nothing to hide because I haven't touched a vote in my life," Calderon's former vice-president Juan Mendoza told sports daily Marca on Thursday. Mendoza is one of the accused.
It was a second blow in succession for Calderon, who was also charged with offences relating to irregularities at a Real Madrid assembly back in December, by a different Madrid court on Wednesday.
Calderon was forced to resign in January to be replaced by interim president Vicente Boluda, after the irregularities came to light in Marca.
Boluda, a board member at the time, has also been charged over the Dec. 7 assembly.
Calderon's resignation threw the Primera Liga club into institutional turmoil and a new election is to be held on June 14.
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