Microsoft is delaying the rollout of the beta of its Longhorn operating system until early next year in order to focus on improving security in... Windows XP... The beta of Longhorn - the successor to Windows XP - was supposed to be distributed before the end of this year, but has now been moved back... The move is likely to delay the commercial rollout of Longhorn, which Microsoft said would only be released once beta trial customer feedback had been incorporated into the product... In 2001, Microsoft spoke about releasing Longhorn in late 2004, but then said it was likely...