Favorites RSS fails to synchronize

I’ve been using Microsoft Outlook 2007 to read my wordpress.org favorites RSS and track threads I was interested in. A few days ago, Outlook started giving me an error message with the code 0xE7204005, claiming that my feed (http://wordpress.org/support/rss/profile/587207) could not be synchronized.

I’ve deleted the definition and tried to recreate it, but Outlook says it’s not a valid feed source.

I cannot find any description for the error message, but since the forum was down when it first happened, I’m thinking this is a wordpress.org forum issue.