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  1. Yes, WIF supports WS-Trust. The docs:

    It'd help if you explained the scenario a little bit more. Are you building a website? Are you trying to authenticate users on "PicketLink".

    WS-Trust is generally used for "rich clients" (used for "active federation"). WS-Federation (and SAML 2.0) are typically used for web sites (used for "passive federation").

    WIF can do WS-Trust and WS-Federation. It can't do SAML (the protocol). Confusion is often augmented by the fact that people use the word SAML to refer both to the protocol and the token format. WS-Federation uses SAML tokens. WIF understands SAML Tokens.