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Lync Server cannot communicate with Public IM if login using Mobile

I have PIC licensing enabled for communicating with Yahoo, GMail and Hotmail (public IM) users and it works great for my Lync users to talk to their Yahoo contacts when the Yahoo contact is using the desktop Yahoo client.  However, when one of the Yahoo contacts is logged into Yahoo Mobile on his smartphone, they cannot communicate at all and presence doesn't flow either way.  The Yahoo user can communicate with other Yahoo users just fine.  Does the Yahoo Mobile client lack something needed to be able to communicate with Lync users (or anybody other than another Yahoo user)?

Regards,
Endrik
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davidsat
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davidsat
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David Johnson, CD, MVPOwnerCommented:
as much as I detest yahoo messenger you could try installing yahoo messenger and check out what is the difference.  it is probably a change in the way that yahoo is sending the status.. do your users not see them as being online? I'm thinking it is in the 'status' of the user not being of the class 'online'/'away'/'busy'/'offline'  

I see the exact same question http://social.technet.microsoft.com/Forums/en-US/ocspresenceim/thread/54d9c5b9-96c3-4bbb-9ba8-a048501b0fc9 and it appears to apply to all mobile clients
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Jeff_SchertzCommented:
The Yahoo mobile client is probably not supported with PIC.  As not all of the different clients available for each PIC partner follow the same 'rules' in terms of SIP compatibility then some clients will provide different levels of functionality when communicating with OCS or Lync via PIC.
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davidsatAuthor Commented:
Dear Jeff,

Thanks for your confirmation.
So the presence will not appear on the Lync.

Regards,
Endrik
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davidsatAuthor Commented:
Lync not support presence with public IM thur Mobile phone
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