Outlook keeps a temporary folder for opening attachments and it is hidden in Windows 7. If a file in that folder becomes locked or corrupt, you can end up as I did… unable to listen to your voicemail messages.

The solution is simple, jump into the temporary folder and clean it out. But…

Even though I had switched off all of the “hide protected operating system files” options in windows, I still couldn’t find the temporary internet folder called outlook.content. 

It should be somewhere like this:

C:\Users\%USERNAME%\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\F2OLM1OC\

But this last part “F2OLM1OC” is system generated. i.e. it won’t be the same on your computer. And, the folder \Content.Outlook\ is not shown if you simply go to your temporary internet folder.

So the easiest way to get to the folder and to navigate straight here… remember to replace “%USERNAME%” with your computer user name (the name you logon with).

C:\Users\%USERNAME%\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook

You’ll find the folder in question inside that one. Or, you can go into your registry to find the location of that folder directly. You’ll find the entry here:

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security

Fixed!