Login with Web Archive

Hello,
I have a subscription that sends a web archive report to my email
address. When I view the report in Outlook 2002, I am prompted with a
Windows login box. The report cosists of two tables and a chart.
In addition there is a 2k attachment with a long name consisting of
number, letters, and dahses.
When I view the same report in RS, the system recognizes my current
login credentials and lets me in without the login box appearing.
We are using Reporting Services SP1 on a Windows 2000 server. Our
email is all done using Exchange 2000.
Why does it ask me to login when I am viewing the report in Outlook?
Any help you can provide is greatly appreciated.
CraigI have also found the part of the MHTML file that may be the problem:
.a57 {
BORDER-RIGHT: black 1pt solid; PADDING-RIGHT: 0pt; BORDER-TOP: black
1pt solid; PADDING-LEFT: 0pt; BACKGROUND-IMAGE:
url(http://oaknccw2k49/ReportServer?%2fIT+Metrics%2fITFS%2fIT+Employee+Reviews&rs%3aFormat=MHTML&rs%3aImageID=5e3cd4b5-ae96-4650-9e3b-f687c89cfbef);
PADDING-BOTTOM: 0pt; BORDER-LEFT: black 1pt solid; WIDTH: 171.45mm;
PADDING-TOP: 0pt; BORDER-BOTTOM: black 1pt solid; BACKGROUND-REPEAT:
no-repeat; HEIGHT: 130.18mm; BACKGROUND-COLOR: white
}
When I browser to that link, I get a "rsStreamNotFound" error.
I have not been able to find anything with a background image other
than my chart and that is working correctly.
Thanks again.
Craig