Corporate Internet service provider LinkAge Online has been sold for an estimated US$20 million to a US Internet firm, according to IT Daily. Buyer PSINet, a leading ISP in the United States, also has bought Internet providers in Japan, Canada, Switzerland and France and turned them into subsidiary operations. The Virginia-based buyer has a backbone based on a private frame relay network with more than 400 points of presence in about 10 countries. PSINet has been expanding its enterprise-class services to offer high-speed LAN (local area network), dial-up, and Web hosting and claims to have about 33,000 corporate accounts. LinkAGE Online claims to have 30 per cent of Hong Kong's leased-line market. It launched its frame relay network last year, and used it to test Internet telephony.