I have also seen this problem in WP 2.6.3 but I am not sure whether it is fixed in WP 2.7. In the HTML code that was posted by levani01, I think that the problem is on the last line --> <!--[endif]-->
The CSS conditional comment that starts <!--[if gte mso 10]> seems to be closed by --> before the <!--[endif]--> so the <!--[endif]--> is not interpreted by IE as a CSS Conditional Comment. It also appears that <!--[endif]--> should be <![endif]--> like it is in the statement that starts <!--[if gte mso 9]>
Internet Explorer 6 or 7 actually displays the <!--[endif]--> on the web page but nothing else is visible after that on the page because IE doesn’t render any more HTML code.
