If you save the changes, the message will no longer be digitally signed – Outlook 2007

Some users receive this message, even though they’ve made no change to the message:

If you save the changes, the message will no longer be digitally signed – Outlook 2007

… while reading digitally signed messages.

This can sometimes be related to an Anti-Virus setting that scans email content and then certifies the message, adding a tag similar to this:

No virus found in this incoming message.

Checked by AntiVirus – www.whateveryouravswebsiteis.com

Version: 8.8 / Virus Database: 880.00.00/8800 – Release Date: 08/08/08