All of my voicemails go into my Outlook email. Every once in a while I receive this error, shown below. This occurs because Outlook saves all the voicemails to a temporary folder in your system. All the files have the same name with a number after it: (I.e.: “voicemail (1).wav”). Once it reaches a certain number–100, to be exact–it can’t save any more so it throws an error.
The fix is fairly straightforward. You need to find the folder Outlook stores those files in, then delete the messages.
1. To find the folder, open up Registry Editor (RegEdit.exe). Navigate to this path:
[NOTE: The number 12.0 may vary with your version of Outlook]
3. Double-click OutlookSecureTempFolder, and then highlight the path under “Value data” and copy it by pressing Ctrl-C on your keyboard. You can now click “Cancel” because you don’t want to edit anything.
4. Now, go to My Computer or Windows Explorer, and paste that path into the title bar.
5. You will now see a folder full of all your temporary files. Find the appropriate Voicemail messages and delete them all.
You will now be good for another 100 messages.
Thanks to this post for sending me in the right direction: http://www.intelliadmin.com/index.php/2007/08/cant-create-file-outlook-error-and-a-the-fix/