The .Net framework version 1.1 SP1 and later adds protection against poorly formed HTTP headers.  This is to prevent the HTTP Response Splitting exploit.  Unfortunately some blogging software produces malformed headers (often using 'Last Modified' instead of 'Last-Modified').  NewsGator will not open these feeds under SP1 and later.

You can set Outlook (and consequently NewsGator Outlook Edition) to allow these badly formed headers.  This will leave you with less protection from this exploit, but we have not found any cases where NewsGator is vulnerable.

1. Create a file with the following text:

<?xml version="1.0" encoding="Windows-1252"?>
<configuration>
  <system.net>
    <settings>
       <httpWebRequest useUnsafeHeaderParsing="true" />
    </settings>
  </system.net>
</configuration>

2. Save the file in your Outlook directory as 'Outlook.exe.config'  This folder is usually C:\Program Files\Microsoft Office\OFFICE10 or C:\Program Files\Microsoft Office\OFFICE11

3.  Stop and restart Outlook.