S/MIME Vs RMS -Part I

S/MIME	RMS
Provides non-repudiation and identity attestation of the sender	Provides information usage policy enforcement
Provides for integrity protection and proof of tampering (signature validation)	Prevents tampering due to encryption
Security boundary may span outside corporate boundaries and firewalls	Policy persisted with the content
End to end encryption prevents sniffing and message interception	End to end encryption prevents sniffing and message interception
Cross-platform interoperability and wide application support	Windows Platform only (98SE and above), CE and Mac next
Two factor authentication for sending and receiving s/mime enabled mail	Prevents users from using expired content or information
Strong encryption and very large key sizes	Fixed encryption key sizes and algorithms
Limited message compression only in OWA	Provides message compression for all modes