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Typically, when you have Outlook 2007 and open an attachment with the same file name 200 times, Windows will stop you from opening it again.  This happens when I receive my voicemails in my emails.  So after opening it 200 times, I get an error.

To clean out the old temporary files, I do this.  I navigate to the registry and look at this key.


In this case, the directory is named as follows:

C:\Users\%%username%%\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\%%random numbers%%

The last part is system generated.  I just delete the files with the name that is repetitive, and bam.  It works again. Or, see this article.