New York--Commerce One, Walnut Creek, Calif., said Wednesday that it has agreed to integrate its business-to-business buying software with server software developed by Interworld Corp., New York. The two companies said they plan within 30 days to begin work on the software, with delivery planned by July. The move is significant because Commerce One has long relied on server software from Microsoft Corp. to manage transactions. Though Microsoft consistently touts the ability of its server software to effectively provide scale--the ability to handle millions of transactions--corporate IT executives generally prefer more powerful Unix-based systems. One of the early e-commerce server software companies, Interworld has for years sold software that runs high-volume transactional sites. It already has a similar deal with Ariba Technologies.