Sorry but try the top ten findings of http://www.google.com/search?q=Outlook%22%2C+%22This+operation+has+been+canceled+due+to+restrictions+in+effect+on+this+computer&start=0&start=0&ie=utf-8&oe=utf-8&client=mozilla&rls=org.mozilla:en-US:unofficial
As to the single user, administrator what many don't know is that the administrator is not God. All accounts must obey permissions. The trouble here is finding the item that is blocking this.
I have a problem that just cropped up. I think it may be related to the last Windows Update, but I am not sure.
When I open an email in Microsoft Outlook that has a link to a web page it will not open the link and it gives me this message, "Microsoft Office Outlook", "This operation has been canceled due to restrictions in effect on this computer. Please contact your system administrator".
This is an XP system with SP3. I updated it after the latest patch Tuesday. I am the only user of the system and I am the administrator. I looked around a little but have no idea what I need to change to allow connecting to links in Outlook.
I use Mozilla Firefox as my default browser and F-Secure provided by Charter as my anti-virus program.
Sorry if this is the wrong forum, but it is an XP system.