The only way the customer knows if anything exists is to have their RSS aggregator software continuously poll the feed for updates.
So instead of a user polling their own email server (their expense) to get their notes, they now have to poll 100 different points to get their updates? Not very efficient and I cannot believe that many organizations will want to take on that type of load.
And moving to a central site that aggregates feeds once, then moves them to a client is not going to solve the "audience of one" issue, since the central aggregating service will still have to poll numerous times to get every client's update. Unless the RSS standard is modified to deliver a packet full of items for many clients, but now RSS is being bastardized like SMTP has to use MIME to do things that SMTP was not meant to do.
Interesting thoughts....
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