To find the Outlook Temporary folder (a.k.a. OLK folder),where Outlook saves temporary data such as attachments. Open the Windows registry using regedit.exe and look for the Registry key OutlookSecureTempFolder using the map below:
Depending on the operating system, version of Outlook and user logged in, the OLK temporary folder is created in a different spot. The good news is it’s simple to find no matter the version of Outlook including the latest versions, Outlook 2007, Outlook 2010 and even Outlook 2013.
This information can be very useful. For example, let’s say you open an attachment, make a bunch of changes then close it before you have a chance to save it or your PC crashes, then you can probably find the file in the Outlook Temporary OLK folder and recover your work.