Outlook may block some MS Access file types: .mdb, .mda, .mde, .adp, .ade. You can use a Registry key to open access to blocked attachments. Run "regedit" to edit the Registry and open the following folder:
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security
Under the key, add a new string value:
Level1Remove
The value should be a semicolon-delimited list of file extensions to unblock. For example,
mdb;mda;mde

Note: Be sure to make a backup before editing the Registry. If you are not comfortable editing the Registry, ask your departmental IT staff for help or contact the ITS Help Desk for assistance.

Article number: 
2525
Last updated: 
July 5, 2016
Service: