On February 11, 2009, a court in Landshut confirmed the verdict.
On February 25 Mahler gets a jail term of six years for publicly 'denying' the holocaust.
On March 11 a court in Potsdam sentenced Mahler to 5 years and two months, again for 'denying the holocaust' on numerous occasions:
Neo-Nazi in Germany gets new jail term for denying Holocaust
Yet another court found Horst Mahler guilty of denying the Holocaust on numerous occasions, which is a crime in Germany.
Potsdam -- A German court slapped another five-year prison term on a neo-Nazi for denying the Holocaust Wednesday, after a separate court sentenced him to six years on the same charges.
The two sentences would be served concurrently.
Lawyers for 73-year-old Horst Mahler, who was immediately incarcerated, said they would appeal the new five-year-two-month sentence.
Judges in Potsdam, near Berlin, found Mahler guilty of denying the Holocaust on numerous occasions, which is a crime in Germany.
A co-founder of the militant far-left Red Army Faction (RAF) in the 1970s, Mahler later swung violently far-right, vehemently disputing that Nazis had systematically slaughtered six million European Jews during World War II.
Last month, a court in Munich sentenced Mahler to six years in jail for calling the Holocaust "the biggest lie in history."
He was also found to have sent offensive CD-ROMs and a book by convicted Holocaust denier Germar Rudolf through the mail.
Mahler was a member of the most radical extreme-right party in Germany, the NPD, between 2000 and 2003 before quitting because he found it "outdated."
He has a string of convictions, including for crimes dating back to his time with the RAF, which carried out a bloody campaign against the West German government.
Last April, he was convicted for giving a Hitler salute to a Jewish journalist in an interview and denying the Holocaust.
He has also praised the September 11, 2001 attacks on the United States and has accused Jews of seeking "world domination."
This is the only source I could find in English.
Here are a few sources in German:
10 months + 6 years + 5 years, 2 months = 12 years
12 years for an opinion. In an alleged free country, a western democracy.