Bain and Kohlberg Kravis Roberts & Co had re-entered the race for MYOB after market turmoil derailed the UK software group's bid to buy its Australian peer.
Archer and HarbourVest bought MYOB, an abbreviation of the phrase 'Mind Your Own Business', for about A$450 million in 2008.
Archer, HarbourVest and MYOB were not immediately available for comment. Bain declined to comment. The sources were not authorized to speak publicly on the matter because the deal has not been announced.
Copyright Reuters, 2011