 Thus iFAX began selling a proprietary product called HylaFAX Enterprise Edition which supported the proprietary interfacing of BrookTrout fax hardware.The development pace was still not fast enough for some, in particular Howard.And so after the 4.1.6 release in May 2003 the code repository was branched into a "4.1" legacy branch, to satisfy the conservative elements, and a "4.2" development branch to satisfy Howard.