LONDON — American millionaire Matthew Mellon was acquitted yesterday of conspiring with private detectives to hack into his ex-wife’s e-mails at Jimmy Choo Ltd. to snoop for financial details during their divorce.

Mr. Mellon, 43, was one of five men on trial at Southwark Crown Court in London on charges related to tapping phones or hacking computers for clients. Two men, including a former police officer, were convicted, according to a statement sent by e-mail from the Metropolitan Police Service.

“This was a major investigation,” Kevin Hyland, a detective inspector with the police anti-corruption team, said in the statement. “In terms of the international scope and number of people arrested, it is one of the most extensive carried out by the Directorate of Professional Standards.”

Twenty-seven men were arrested after BT Group Plc found equipment used to tap telephone lines and contacted police. The detectives also used a U.S.computer expert to hack into news agencies to obtain information before the U.S. stock markets opened, the jury was told.

Scott Gelsthorpe, 32, a former police officer was found guilty on two charges related to conspiring to hack computers and intercept communications. Gelsthorpe helped run the detective agency, Active Investigation Services, and arranged to bug phones and monitor computer networks, the statement said.

David Carroll, 59, was found guilty on six charges related to computer hacking and intercepting communications.

Jeremy Young, 39, who was a serving police officer while he ran AIS with Gelsthorpe, pleaded guilty in April to computer and phone-related charges. Young is also awaiting sentencing.

The three men couldn’t be immediately reached to comment. The phone number for AIS has been disconnected. Julian Goose, Carroll’s lawyer, declined to comment. Gerald Mohabir, Gelsthorpe’s lawyer, was in a meeting and didn’t immediately return a phone message.

Mr. Mellon said he didn’t know how detectives obtained what appeared to be a company e-mail from his ex-wife Tamara Mellon, founder of the celebrity shoemaker Jimmy Choo, arranging for a transfer from an offshore bank account, according to a taped police interview played to jurors during the trial. The e-mail, which Mr. Mellon gave to his lawyers, proved to be fake.

“I only know I exercised my right to gather evidence,” Mr. Mellon told police in the interview after they raided his apartment and seized his computer, mobile phones, and documents.

Mr. Mellon is a descendant of American banker Andrew Mellon, according to a Vanity Fair report on the case.