P7S and P7M files

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