We have an Office 365 setup with Lync. I am able to sign in to Lync on PCs not on the Domain, but on my Laptop at home or on the office guest connection. When attempting on a Domain connected PC we get the error
"The Server is temporarily unavailable, if the problem continues please contact your support team."
Microsoft support have confirmed that all out DNS settings are correct and since it works from an other machine they must be, they have had the logs but can't see what is wrong, I've been in contact with them for about 10 days and most days they don't make sense, they certainly haven't progressed the incident at all.
I wondered if anyone else had any ideas. The Firewall I'm sure will allow any traffic over any port out so I don't think that is it.