Thursday, 22 March 2012

Outlook blocked access to the following potentially unsafe attachments

You may receive the following message when using Microsoft Outlook 'Outlook blocked access to the following potentially unsafe attachments'

You'll generally receive this message if somebody has e-mailed you a file type that it deems to be dangerous (such as a registry, or Javascript file) whilst thic can be useful to stop you opening any malicious content you may actually want to be able to receive these kind of files, so how to remove this restriction?

First of we're going to be making some changes in the registry, so please make sure you back-up the registry first just in case:

1. Close Microsoft Outlook and Open the Registry Editor (regedit from the run dialogue)

2. Navigate to 


(Replace version number above with one of the following version numbers and you'll find key in no time)

Outlook 2010 - 14.0
Outlook 2007 - 12.0
Outlook 2003 - 11.0
Outlook 2002 - 10.0
Outlook 2000 - 9.0

3. Does the key exist? If so go to Step 5, if not go to Step 4

4. If the Key does not exist navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\VERSIONNUMBER, choose EDIT > NEW and create the Outlook Key, and from under Outlook choose EDIT > NEW and create the security key

5. Click Edit > New > String Value and name the new value Level1Remove

6. Right Click the new string value you have created and click Modify

7. Type the file extension you wish to have unblocked in Outlook such .reg for instance, if you wish to unblock multiple file types then separate the file types using the ; sign, for instance this would look as follows: .reg;.exe

8. Click OK

9. Exit Registry Editor

10. Restart Outlook

11. Your file type should now be unblocked in Outlook.