Microsoft co-founder Paul Allen has blamed his former friend Bill Gates for a $40-billion loss that he said he incurred by not investing in AOL, said reports.

According to the reports, Gates was accused for not letting Allen invest in AOL which could have earned him $40 billion. Allen also said Gates argued with him that Microsoft would be able to see off AOL.

In his autobiography Idea Man, Allen has also blamed Gates and his other colleagues of plotting to remove him from the company, who was reportedly ill most of the times, said a report in Business Insider.

Despite being an influential figure in Microsoft, Allen was out by 1983.