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you will also need the infrastructure for the domain that you own for the lync server.. you simply can't have abc.com cert for def.com lync server
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you will also need the infrastructure for the domain that you own for the lync server.. you simply can't have abc.com cert for def.com lync server

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just to make sure I understand -- <br />
on the inside, you have domain1.com (and this is .com and not .local, .ad or .internal? )<br />
and on the outside you have domain2.com? <br />
<br />
I've used public certs only for one Lync installation - but this one needed both the external and internal domain names
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just to make sure I understand --
on the inside, you have domain1.com (and this is .com and not .local, .ad or .internal? )
and on the outside you have domain2.com?

I've used public certs only for one Lync installation - but this one needed both the external and internal domain names

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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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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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I need to deploy lync 2013 in my domain (xyz.com). 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 (xyz.com) vendors are not issuing me even internal certificate. can i change the FQDN of my lync from xyz.com to abc.com (one i own)?
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I need to deploy lync 2013 in my domain (xyz.com). 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 (xyz.com) vendors are not issuing me even internal certificate. can i change the FQDN of my lync from xyz.com to abc.com (one i own)?

Lync 2013 Certificate requierment

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.