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My corporate IT department has mandated a change to Microsoft's Lync for instant messaging, among other purposes. I installed it and launched; it automatically found the server it needed, since my corporate address book was available and I could IM folks in it. I then added a contact outside my company and it found the person even before I finished typing the name; she is listed with "presence unknown" in my contacts list (IM service is MSN). When I attempting to send an IM, however, I think it tried to tell me it failed. (I am not sure because it did not say it failed(!); it just mentioned that "When contacting your support team, reference error ID 504 (source ID 239)." I thought, "Well that was nice of it to be so proactive; if and when I have a need for support, I have a number to provide--yay!")

A web search for the error code did not shed any light for me; the Lync overview page indicates outside IM contacts may be used, so any suggestions on how to make this IM connection work?

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up vote 3 down vote accepted

Lync server must have public IM enabled to be able to use federated IM. Have you confirmed your IT department has enabled it?

http://lync.microsoft.com/en-us/Product/Technologies/Pages/public-im-connectivity.aspx

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No I have not checked because I was not aware of the setting--thanks for the pointer. –  Michael Sorens Jun 11 '11 at 18:39

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