Applies to: Applies to: Microsoft Outlook 2010 or Outlook 2007
A user complained that Outlook 2010 was blocking access to a Word document attachment he sent to a Task using Word's Create Outlook Task command.
I'm receiving this message in Outlook 2010 when opening a task created by Microsoft Word 2010:
"Outlook blocked access to the following potentially unsafe attachments"
I tried the Level1Remove registry fix but this did not work. I disabled Protected View (in Trust Settings) within Word. Still no go. Why is Outlook blocking attachments from its own software (Word)?
This security issue affects Outlook 2007 and up. The file is blocked because it's not a doc file, it's a *shortcut* to the doc file and shortcuts are potentially "dangerous".
You need to configure the security settings to not block the file. In Outlook 2007 and Outlook 2010 you can use the following registry keys to change the Security settings. You'll need to restart Outlook for the keys to take effect.
Enabling ShowLevel1Attach will allow users to open or save potentially dangerous attachments. While an updated antivirus will catch older exploits if users try to save or open the attachment, it could miss new exploits not yet in it's virus definition file.
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\security DWORD: ShowOLEPackageObj Value: 1 DWORD: AdminSecurityMode Value: 3 DWORD: ShowLevel1Attach Value: 1
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Outlook\security DWORD: ShowOLEPackageObj Value: 1 DWORD: AdminSecurityMode Value: 3 DWORD: ShowLevel1Attach Value: 1
Do It For Me
I have a reg file to unblock all attachments and OLE objects. Save the text file with the extension .reg then run it. It works with non-Exchange accounts.
Network users may be blocked by group policy, so this should only be used by SOHO users - everyone else should speak to their admin.
You'll need to restart Outlook for the key to take effect.
Information for administrators about e-mail security settings in Outlook 2007
You cannot open linked file attachments in Outlook: "Outlook blocked access to the following potentially unsafe attachments"