Lync 2013 Certificate requierment

I need to deploy lync 2013 in my domain ( Due to compliance limitation i cant build an internal CA server now. I am planing to buy certificate for my front end server from external vendor. However, as i don't own the public domain name ( vendors are not issuing me even internal certificate. can i change the FQDN of my lync from to (one i own)?
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David Johnson, CD, MVPOwnerCommented:
you will also need the infrastructure for the domain that you own for the lync server.. you simply can't have cert for lync server
Jakob DigranesSenior ConsultantCommented:
just to make sure I understand --
on the inside, you have (and this is .com and not .local, .ad or .internal? )
and on the outside you have

I've used public certs only for one Lync installation - but this one needed both the external and internal domain names
Leon FesterSenior Solutions ArchitectCommented:
can i change the FQDN of my lync from to (one i own)?
Yes, you can change the FQDN to any domain that you have.
Be sure to re-run the topology builder again.

Certificates are used to create a secure channel and provided that the correct CA or certificate chains are installed then it should work.

Internal CA is not entirely needed as you can use self-signed certs internally but in your case I think it would be less complicated if you use the public certs.

Is there any chance that there is an existing wildcard certificate for You should be able to re-use it in your Lync setup.

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biplabmukhAuthor Commented:
Thanks all for the input. After all alternative we have extended the retirement of out CA server so we don’t need to work on above requirement.
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