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In theory, if you change the URL in the feed to point to the new location and return the XML with a 301 (Moved Permanently) response code, the feed reader will
by davidjohnstone 14y ago
In theory, if you change the URL in the feed to point to the new location and return the XML with a 301 (Moved Permanently) response code, the feed reader will update its record to the new location.
However, Feedburner doesn't appear to allow a user to control that, so I believe all that can be done is to put up a "We're moving" blog post and have readers manually add the new blog. (Yay for vendor lock-in...)