CSFB's technology team has survived internal turmoil and star banker Frank Quattrone's resignation by landing a sole advisory mandate for Yahoo, the US internet provider, on its $1.6bn (€1.4bn) purchase of Overture.

Quattrone was forced to resign in March after being suspended on full pay. He has pledged to fight allegations made against him that he encouraged staff to delete e-mails after he learned of a grand jury probe of CSFB's securities unit.