lync for mac 2011 the system is unavailable now

The certificate your Exchange server is using will be displayed: To find the thumbprint, open Outlook Web Access (OWA) from an internet browser, click on the “Lock” icon in the browser and choose “View Certificates”: The command requires you to know the “thumbprint” from the root certificate. To work around the limitation in Lync Phone Edition there is a Lync Management Shell command that will allow you to add the public providers root certificate to the Web Services Configuration on the Lync servers.

Exchange does not support Pin Auth currently, so this article does not apply to devices that are not tethered. *Note – A Lync Phone Edition device (other than CX700/Tanjay) will require the tethered connection between the PC/Laptop and phone to authenticate to Exchange and view the calendar. As expected, I immediately saw the error when I tried to access the calendar.

I created a test account ( and signed in via a tethered CX600 (Aries) phone. Certificate Issued By: Internal Certificate Authority (Lyncguys-LG-DC-CA).To reproduce this issue I have configured a lab environment as follows: The root of the problem is the Lync Phone Edition devices will not trust a CA other than the one that issued the certificate to the Lync pool it is connecting to. This problem has become more and more common as organizations move to using certificates from Public CA on their Exchange servers internally. The most common cause of this error I have seen is having the Lync pool certificates issued from a different Certificate Authority (CA) than the Exchange server certificates.

The problem is that Lync Phone Edition devices that are tethered receive the message “Connection to Microsoft Exchange is unavailable. Please contact your support team”. Today I’d like to talk about certificates and a problem that seems to be becoming more and more common with Lync Phone Edition.

Lync for mac 2011 the system is unavailable now