Microsoft has had to reissue its last two quarterly earnings reports after it discovered clerical errors had led to lower than actual calculations of unearned revenue.
For the three months to 30 September 2001, Microsoft has now recognised £1.88bn in unearned revenue and $2.07bn in new unearned revenue.
Previous figures from the company were also reported in the firm's Q4 results.
At the time, Microsoft had filed that its unearned revenue to 30 September was $914m and new unearned revenue was $1.1bn. Both figures are less than half of the new numbers for the period.
The company revised its unearned revenue - generally defined as earnings from investments, but in this case specifically referring to products that have a long life cycle or licences lasting more than one year.
For example, rather than realising the revenue from a two-year licence immediately, the company would spread the earning over the two-year period.
Microsoft said the faulty numbers had not changed its net cash from operations figure.
Computer Associates, which is now the subject of an SEC inquiry, changed to the unearned revenue model of reporting 15 months ago.
The move is not unusual. New accounting practices known as Generally Accepted Accounting Principles (GAAP) were introduced worldwide last year, leading to confusion amongst many enterprises.
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