"The message has a digital signature, but it was not validated" Error Message in OWA

Outlook Web App (OWA) does not provide support for digital certificates because it does not include support for S/MIME. If you received an email message that included digital signature, you may see "The message has a digital signature, but it was not validated" error.

To resolve this problem, you can follow these steps:


 1. Click Start, click Run, type Regedit, and then click OK.

2. Locate and then click the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeWEB\OWA

3. On the Edit menu, point to New, and then click DWORD Value.

4. Type CheckEmbeddedSmime, and then press ENTER.

5. Right-click CheckEmbeddedSmime, and then click Modify.

6. In the Edit DWORD Value dialog box, under Base, click Decimal.

7. In the Value data box, type 1, and then click OK.

8. Exit Registry Editor.