Have just downloaded new version, thanks, but now cannot open email inbox although can on notebook with older version ???

Main desktop computer refuses to open email inbox with statement 'undefined new emails'. I have not updated my notebook and the inbox can be opened and mail read?
If this can be as a result of new version could the solution be in small words for the simple minded please

Firefox 4 requires at least OS X 10.5, you can get Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

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