I'm not using IE8 that often anymore, but from time to time I can't avoid it. Two issues I do currently remember:
Although my default setting is top posting, the signature is placed at the bottom of the message. The cursor is placed at the top, though. With FF all is OK.
When I want to open a PDF attachment, the browser often (always?) hangs. I believe this issue had been discussed already...? If more details required, please ask.
Michael Heydekamp Co-Admin freexp.de Düsseldorf/Germany