Lync can't IM chat to OCS pool and vice versa.

We have OCS 2007 R1 installed in our company. I sucessfully installed Lync 2013 server. I migrated a user to the Lync server. When a Lync enabled user talked with an ocs enabled user, the following error appear :

When contacting your support team, reference error ID 504 (source ID 239).

Any ideas?
artcrestAsked:
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Jeff_SchertzCommented:
Migration directly from OCS R1 to Lync 2013 is no supported by Microsoft:
http://technet.microsoft.com/en-us/library/gg425746.aspx

You should have performed a two-hop migration, as coexistence between both versions of your pool is not supported.  I would suggest moving all of the users to Lync as soon as possible.
Mohammed HamadaSenior IT ConsultantCommented:
I agree with Jeff, the reasonable thing which you could've done is checking the internet how to do the migration properly but I think you have just went without even checking if there's a supported way of migration from OCS to Lync 2013.

In case you don't want to migrate all your users then your only resort is getting a MS support ticket to see how you can solve this with the two current environments .
artcrestAuthor Commented:
None of the answer was correct - I have figured out how to coexist OCS and lync 2013 and it is supported,

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artcrestAuthor Commented:
The answers by others were not helping.
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