Why some blog entries at MSN Space support rss feed while others don't?

[liuyuprc]

Not sure if this is the place this question should even be raised, but
I am deeply troubled by this problem for days. I am now desperate.
When i tried to add the blogs at MSN Space of my friends' to google
reader, some of them don't support rss feed, so i cannot add them. You
guys have any idea how to enable RSS at one's blog entry so it can be
subscribed?

thanks!