Why does it say 404 page not found when I try to view my business email inbox?

I have a pop account and when I'm trying to go to the inbox, it says page 404 not found...anyone else have this problem?
Why does it say 404 page not found when I try to view my business email inbox?
I am having the same problem with Yahoo Small Business Mail. I am getting HTTP 500 Internal Server Error. I have been down for 2 hours now and cannot get a hold of anyone from Yahoo.
Reply:Yes, I occasionally get the same issue. I've looked through the help/ email help, and all I've found so far is that there are sometimes 'traffic congestion' issues with the phone lines trying to reach the server my yahoo site's on. Today for some reason, it is unusually bad. Funny thing is, when I open the site via www protocol, or ftp, no trouble. I've cleared my browser cache, but that might also clear login/signon. If I get anything further, I'll post.
Reply:I also cannot get into business mail - for an hour now