Hi Eric,
Based on your reply, I’d like to confirm if you get the error message after you login by using the Microsoft account (E.g. outlook.com, Hotmail.com).
Note: The account we are using to loginto OWA maybe Office 365 account.(E.g account@user.onmicrosoft.com, account@customedomain)
If so, could you please provide us with a screenshot of the error message?
In addition, I’d like to explain that Microsoft Document Connection is an application for Mac that can be used to connect to the Share Point Site by using the Office 365 credentials. It’s a SkyDrive and SharePoint connection tool.
According to the current situation, here is a specific support channel for you. You may reach the support by the following link:
http://answers.microsoft.com/en-us/mac
Best regards,
Lawliet Xu