Making an unbeatable challenge in the corporate microcomputer market, Apricot Computers Plc yesterday laid down the gauntlet to IBM and anyone else pursuing the corporate market by accompanying its six-model Qi line of 80386-based Micro Channel Architecture machines with a Sealed Box model that costs just UKP1,800 with 65Mb disk and Ethernet built in, when you buy 10 or more of the things at a time and install them yourself. The Sealed Box is based on the 16MHz 16-bit bus 80386SX version of the chip, and sets a new marker price for 80386 machines in the corporate market: the price also includes a paperwhite monitor and 1Mb of memory.