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http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q234067&

Uddrag:

HOWTO: Prevent Caching in Internet Explorer
The information in this article applies to:
Microsoft Internet Explorer (Programming) 4.0, 4.01, 4.01 SP1, 4.01 SP2, 5, 5.5

Summary
This article describes the use of HTTP headers to control the caching of Web pages in Internet Explorer.

You can use Microsoft Internet Information Server (IIS) to easily mark highly volatile or sensitive pages using the following script at the extreme beginning of the specific Active Server Pages (ASP) pages:
<% Response.CacheControl = "no-cache" %>
<% Response.AddHeader "Pragma", "no-cache" %>
<% Response.Expires = -1 %>

Det var lidt hurtigt, test lige om det virker...

Her er lidt mere....
http://asp101.aspin.com/func/goto?id=1361910&cob=asp101

<%
Response.Expires = 60
Response.Expiresabsolute = Now() - 1
Response.AddHeader "pragma","no-cache"
Response.AddHeader "cache-control","private"
Response.CacheControl = "no-cache"
%>