http://support.microsoft.com/kb/223799/
This article applies to the following:
• | Microsoft Internet Explorer 5.5 Service Pack 1 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.0 |
• | Microsoft Internet Explorer 4.01 Service Pack 1 |
• | Microsoft Internet Explorer 4.01 Service Pack 2 |
• | Microsoft Internet Explorer 4.0 128-Bit Edition |
• | Microsoft Internet Explorer 5.5 Service Pack 1 |
• | Microsoft Internet Explorer 5.5 Service Pack 1 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.0 |
• | Microsoft Internet Explorer 5.5 Service Pack 1 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.0 |
• | Microsoft Internet Explorer 4.01 Service Pack 1 |
• | Microsoft Internet Explorer 4.01 Service Pack 2 |
• | Microsoft Internet Explorer 5.5 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.0 |
• | Microsoft Internet Explorer 4.01 Service Pack 1 |
• | Microsoft Internet Explorer 4.01 Service Pack 2 |
• | Microsoft Internet Explorer 4.0 128-Bit Edition |
• | Microsoft Internet Explorer 5.5 Service Pack 1 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.01 |
• | Microsoft Internet Explorer 5.0 |
• | Microsoft Internet Explorer 6.0 |
• | Microsoft Internet Explorer 6.0 |
• | Microsoft Internet Explorer 6.0 |
• | Microsoft Internet Explorer 6.0 |
• | Microsoft Internet Explorer 6.0 |
So obviously it's very important.