Messenger instant chat HTML tags

Mini-post as reminder. The four special HTML tags to allow chatting with a contact or Agent from an hiperlink, add it to your contact list and other stuff:

<a href="msnim:chat?contact=sample@email.com">Chat</a>
<a href="msnim:add?contact=sample@email.com">Add to contact list</a>
<a href="msnim:voice?contact=sample@email.com">Voice chat</a>
<a href="msnim:video?contact=sample@email.com">video conversation</a>

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