Can Outlook 2007 automatically clean attachments from Secure Temporary File folder?

<p>My Boss has a&nbsp;password protected local PST file that he keep his "super secret stuff in".&nbsp; Occationally when he is on the road he'll have his secretary go into his computer for some piece of information he needs, but he feels confident that his "super secret stuff" is safe as she doesn't have the password for his PST.</p><p>While opening an attachment from an email the other day,&nbsp;he accidently browsed the secure temporary file folder that Outlook uses which he was unawre of and to his surprise, shock and horror, there were some of his "super secret" attachments left over in this folder.</p><p>(Secure Outlook File Folder is located: C:\Documents and Settings\username \Local Settings\Temporary Internet Files\Content.Outlook\&lt;random character&gt; )</p><p>His computer is running XP (SP3) with Outlook 2007 (SP3).</p><p>I was wondering if anyone could answer 2 questions:</p><ol><li>Why this folder isn't clean out given the sensativity of most corporate attachements</li><li>Is there anyway to have Outlook automatically clean this folder</li></ol><p></p>