Select all attachment caches with pressing the Ctrl + A keys, and then press the Delete key. Step 7: Then you open the temporary folder of attachment cache. Step 6: Open a folder in your computer, and then paste the path into the address box, and press the Enter key. Step 5: Double click the item of OutlookSecureTempFolder to open it, copy the path in the Value data box of Edit String dialog box, and then click the OK button. Outlook 2007: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security Outlook 2010: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security Outlook 2013: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Security Step 4: In the Registry Editor window, open the Security folder with following paths: Step 3: In the popping up User Account Control dialog box, click the Yes button. Step 1: Press the Win + R keys at the same time to open the Run dialog box, enter the regedit in the Open box, and click the OK button.
To clear all attachment caches of Microsoft Outlook, you can do it with following steps:
