Redmond, Wash.--Microsoft Corp. said it has used a specially tuned, lightning-fast Internet spider to find more than 7,000 instances of illegal content infringing on its corporate brand and products. The spider found illegal Microsoft content in 33 countries on six continents. Microsoft said it would continue to run automated checks for infringement. The development is significant for b-to-b marketers, who currently use time-consuming manual searches to look for brand violations. Microsoft did not disclose the name of the technology or service it is using to thwart Internet brand violators, but it said more than 3,000 illegal auctions were taken down last month.