Create a batchfile for my users that run into this problem
del "c:\documents and settings\%username%\local settings\temporary internet files\(OLK folder name)\*.pdf"
The OLK foldername can be found in the registry, as stated before, by searching for "OutlookSecureTempFolder"
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You need to enter this in a logout script
The reason for putting it in the logout instead of the login script is to prevent sensitive documents from being left on the local hard drive over night where they can be easily accessed.