The article reports that Research in Motion Ltd. (RIM) is building BlackBerry messaging devices that run over wireless LANs, company officials confirmed last week. RIM, of Waterloo, Ontario, has started testing BlackBerrys that can roam between 802.11, or Wi-Fi, WLANs and wide-area cellular networks. "We've been working on Wi-Fi for a long time," said Jim Balsillie, chairman and co-CEO of RIM. RIM's BlackBerry devices provide wireless access to corporate e-mail and other data via BlackBerry Enterprise Server โ server-side software that sits behind the customer's firewall.