Yahoo !mail -help needed!

[flamespitter]

I have been using 'Yahoo!Mail' for about 6 months.I keep my incoming and outgoing mail in each folder and do not empty the folders.Although the 'bar chart'shows I have only used 6% of the 1GB capacity I have discovered I cannot open any mail more than about 4 weeks old, either sent or received.The message I get is;
'We didn't understand your request.The request sent by your browser was missing some information.Please try again.'
Needless to say I have been unsuccessful.I do need to get into the dozens of old messages.Any suggestions Guys?

[mattley]

Which OS, and browser are you using?

IF W2k or XP and IE6 then I'd try Yahoo support.

If not try IE. Stupid I know, but it's usually the only browser that everthing is thourouhly tested on.