how to unblocked?
Make sure Outlook is closed.
Open your registry editor by opening the Run command and type regedit (regedt32 for Windows 2000)
Locate the following key
Outlook 2000 [HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security]
Outlook 2002 [HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security]
Outlook 2003 [HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security]
Outlook 2007 [HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security]
Go to Edit-> New-> String Value and name the value Level1Remove (case sensitive!)
Double-click on the newly created value and enter the extension including the “dot” that you want to open in Outlook. For instance .exe
If you need to enter more than one extension you’ll have to type separate them by a semicolon like this; .exe;.bat;.url
Press OK on the input box and close the registry editor
When you open Outlook the attachments which hold those extensions aren’t blocked by Outlook anymore.
There is easy tools as well: