Error Verbiage:
cannot create file:msg0001.wav.Right click the folder you want to create the file in and then click properties on the shortcut menu to check your permissions for the folder (microsoft outlook)
The problem was that the attachments downloaded to the outlook secure temp folder were "maxed" out. Outlook downloads attachments to this folder and names files with similar names by appending a (1) or (2) etc. Once this number gets to (199) outlook is unable to save the file to that secure temp folder and throws an error for permissions. Deleting the contents of the secure temp folder resolves the issue.
Outlook 2010
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security
or
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\Security
Value Name: OutlookSecureTempFolder
Data Type: REG_SZ
Outlook 2007
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security
or
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Outlook\Security
Value Name: OutlookSecureTempFolder
Data Type: REG_SZ
Outlook 2003
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security
or
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\11.0\Outlook\Security
Value Name: OutlookSecureTempFolder
Data Type: REG_SZ