It may be necessary to adjust the following limits.
If the subject of an imported e-mail contains a long text, the request URL may exceed the default limit of Microsoft Internet Information Services. Information about increasing the limit can be found here (UrlSegmentMaxLength):
http://support.microsoft.com/kb/820129: new window
If the file name of an imported file contains many special characters, the escaped request URL may exceed the default limit of Microsoft Internet Information Services. Information about increasing the limit can be found here: