Paul Roberts and Joris Evers

A new campaign by malicious hackers uses a Web site designed to look like Microsoft Corp.'s Windows update page to trick unwitting Internet users into infecting their computers with a Trojan horse remote access program, according to antivirus experts at Sophos PLC.

Microsoft Corp. is getting ready to release a beta version of antispyware technology it purchased last month to the public, but will delay promised antispam and antivirus improvements to the Exchange e-mail server, according to information provided by the company.

Microsoft Corp. is revising a security patch for Windows XP systems with Service Pack 1 installed after customers complained that installing the patch slowed their systems down to a crawl.