I couldn't believe how easy it was to encrypt and sign messages using digital certificates in BizTalk
Let me summarize the steps involved in process
1. Order certificate from certificate authority like VeriSign
2. Once you get certificate; open certificates snap-in
To open go to
(Start->Run->MMC )
File-> Add New Snap in -> select Certificates for Local Computer and Current User
3. Import private key in Current User->Personal folder
4. Import public key in Local Computer-> Other People
5. Create a new send pipeline (or u can use existing custom pipeline if you've) drag Mime/SMime encode shape on Encode block
6. In Properties of Mime shape set encryption = true
7. Deploy the pipeline
8. In biztalk explorer select send port which you want to use; assign this pipeline to it; select the certificate name
and you are ready to go
9. Process of creating receive pipeline for decrypting messges is fairly simillar to this; except there is decode block in there and not encode
Cheers
Vishy