For the past few weeks, I have been noticing that all of a sudden, the unread count in a lot of my folders in [[http://reader.google.com|Google Reader]] has dropped significantly. I haven’t read that many articles, nor have I removed any prolific feeds. The only other explanation is that Google Reader is archiving (or at the very least, displaying) lesser data than before.
I couldn’t find anything in the Settings that would govern how far back in my feeds can I go. The [[http://www.google.com/support/reader/|Help Center]] doesn’t have any useful answers either. Does any one know the details on this? I’m also interested to find out what data the Search function has access to: that is, is the search capable of going back beyond what Reader shows to me?