In response to Google's announcement to anonymize user data after 18-24 months and possibly the response by Ask.com to launch AskEraser and also to anonymize user data after 18 months, Microsoft has taken a similar stance, according to a Reuters report and Microsoft Press Release.
Specifically, Microsoft said it would make all Web search query data anonymous after 18 months on its "Live Search" service, unless it receives user consent to store it longer. The policy changes are retroactive and worldwide, it said.
WebmasterWorld members think that it's a good step, though many would rather it be defined by the user, possibly in the browser settings.
Forum discussion continues at WebmasterWorld, and blog buzz continues at Techmeme and Search Engine Land.