My organization transitioned from running Office Communications Server 2007 to Lync via Office 365. One of the benefits of the Office 365 implementation is that you can run applications like Lync while properly on the corporate network or while remote with Internet access.
Though our organization is strictly a Windows computing environment, there are a few people within the IT department that run Macs at home. As I was one of them, I wanted to explore running Lync on Mac OSX 10.9 Mavericks.
I downloaded Lync for Mac 2011, but was having difficulty signing in.
Investigating online, I found this article:
http://onlinehelp.microsoft.com/en-us/office365-enterprises/hh534388.aspx
But still, things weren't working:
A support call to Microsoft didn't yield the answer at all. I assumed it was a very minor detail, and that was correct. After days of nothing, I stumbled across the correct configuration.
Ensure you've got all the updates downloaded for Lync / Office 2011 for Mac.
Correct syntax for sign in is to use your email address in both the email address AND user ID fields. I was trying username or domain\username and getting no results.
In the Advanced options, you want Use Kerberos authentication unchecked, and the radio button to use Automatic Configuration, as shown below:
At that point, you'll be able to sign in.