Opening P7M files
Did your computer fail to open a P7M file? We explain what P7M files are and recommend software that we know can open or convert your P7M files.
What is a P7M file?
Files that contain the .p7m file extension hold encrypted email messages. The P7M file format is a container format and the contents and the attachments of the encrypted email message are enveloped into the encrypted P7M file.
Oftentimes a user must have a private key installed into their email client in order to open the P7M files that they receive. The private key will match the message's public key so that the user can open the P7M file. This private key is static and does not change so that a user does not have to enter new information to open each P7M file they receive.
The P7M file format implements the Secure/Multipurpose Internet Mail Extension standard (S/MIME).
Software that will open, convert or fix P7M files
Try a universal file viewer
In addition to the products listed above, I would suggest that you try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and very likely yours too! Download Free File Viewer.