P7S and P7M files

1. I have an msg file which is digitally signed and not encrypted, I could see 2 attachments from the email one is .P7M and the other one is .P7S. Can this happen ? I mean it should be either a .P7m file or a .P7s file right?
2. Can .P7s file support encryption and digital sign both?
3. Can you explain in detail the difference between .P7m and .p7S files?
Shruthi RentalaAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Alexei KuznetsovMicrosoft Outlook MVPCommented:
P7M is a message (signed and/or encrypted) and P7S is a certificate.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Alexei KuznetsovMicrosoft Outlook MVPCommented:
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.