Unblocking attachments in Outlook

Occasionally I want to allow some of those attachments which Outlook blocks by default, when I know it’s a trusted  installation file for example. Microsoft publishes a list of attachments which are blocked here, for me its usually .exe and .msi files.

There are applications out there that will let you amend Outlook settings using a GUI (OutlookTools is a good free one) but if you aren’t afraid to amend the registry its an easy change to make.

Before showing how to make these changes I would like to say that these attachments are blocked for security reasons, so I would suggest reversing these changes once you’ve received that trusted file (I tend to keep a .reg file to apply the change to allow the common .msi and .exe and then  another to revert back to default).

OK, so the process is:

1. Close Outlook.

2. Open the registry editor and locate the following key:

Outlook 2010: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security

Outlook 2007: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security

Outlook 2003: HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security

3. Add a new key by selecting Edit > New > String Value and typing Level1Remove and press enter

Double-click this new key (or select Edit > Modify) and type the extensions you wish to allow (include the preceding ‘.’ and seperate multiple values with a semi-colon) as below:

4. Press OK, then close the registry editor

5. Open Outlook and access those trusted attachments :)

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