Lync and Skype Contact problem

Question

Dear Support Team,
My company do Lync and Skype federation that I found the problem below:
1. If user has used Microsoft Lync and federate with Skype by using Microsoft Account, it connected. but If Skype user is not Microsoft Account, they have used Skype ID. they shows Presence Unknown.
2. Some Skype user that used Microsoft Account, they will not receive invitation. when Lync user invite Skype user. 

Answer 1

1. The Skype ID must be associated with a Microsoft ID in order to work. This is why you receive "Presence Unknown" with non-Microsoft ID enabled accounts. See here: http://technet.microsoft.com/en-us/library/dn440172.aspx specifically:
"All Skype users wishing to connect to a Lync user must have a Microsoft Account associated with their Skype IDs and sign in using the
Microsoft Account.  This can be enabled within the Skype client."
2. Do those Skype users have a Microsoft account paired with their Skype ID? If not, they won't receive an invitation, because the invite
is never sent to them. Can you give more detail on the users that don't receive the invite, is there something they have in common?
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Georg Thomas | Lync MVP
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@georgathomas
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This forum post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.