The confidential emails from Anschutz Entertainment Group (AEG) obtained by The Los Angeles Times suggest that in the weeks before the King of Pop's sudden death in June 2009, he was drinking and feared himself he could not perform.
The paper said the 250 pages of messages "illuminate the extent to which top executives" at the Los Angeles-based company "were aware of doubts about Jackson's stability" as they prepared for the 50-show concert series.
'Are you kidding me?'
"MJ is locked in his room drunk and despondent," wrote AEG Live director Randy Phillips to his boss, company president Tim Leiweke in March 2009 reports the LA Times.
Leiweke's immediate reply to this email was: "Are you kidding me?"
"I screamed at him so loud the walls are shaking," Phillips responded. "He is an emotionally paralysed mess riddled with self-loathing and doubt, now that it is show time."
The legendary singer was in London due at a press conference to announce the concerts. When Jackson finally appeared, 90 minutes late, reporters noted his remarks seemed "disjointed and strange", the Times said.
"He is scared to death," wrote Phillips, who, according to the emails, ended up having to dress the singer with the help of Jackson's manager.
Contract was solid
As doubts about the star mounted, AEG executives worried whether Jackson was going to be able to perform, according to the Los Angeles Times.
However, the company felt confident their contract was solid.
"We cannot be forced into stopping this, which MJ will try to do, because he is lazy and constantly changes his mind to fit his immediate wants," wrote another AEG Live executive, Paul Gongaware, to Phillips.
"He is locked. He has no choice," Gongaware continued.
Immediate psychiatric evaluation
Just weeks before the concert debut, scheduled for mid-July 2009, show director Kenny Ortega warned Phillips "there are strong signs of paranoia, anxiety and obsessive-like behavior."
An immediate psychiatric evaluation was called but this was a suggestion which AEG resisted.
Jackson died soon after, on 25 June at age 50, from an overdose of propofol, a powerful anaesthetic.
Jackson was in good health
His former doctor, Conrad Murray, was jailed for four years in November after being convicted of involuntary manslaughter over the singer's death.
The email accounts contrast with AEG's public statements and with a medical assessment the company arranged as a condition of the contract that Jackson was in good health.
The messages are likely to figure in legal proceedings against AEG by the insurance company that had to pay out when the concerts were cancelled. The insurance company wants the payout nullified, alleging AEG falsely represented Jackson's readiness to perform.