Even an OPML file of RSS feeds can tell you a lot about a person says Alex Barnett, MSDN International Program Manager, Microsoft.
Basically I'm pretty sure that as the market matures that we will have services which can recognise this.
Everyone is planning to allow you attention data (your OPML files, profiles, etc) can be plugged into a Microsoft system.
Grehan: Logging in is a huge issue since Google has very few logging in compared to Yahoo and MSN.
Barnett seemed to be saying that there's a more of an opportunity in allowing people to move their data around than there is in locking it up.
[Ed note: This relates to rumous that Google, Yahoo and MSN may actually end up collaborating on a standard for this].
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