Mac Single Sign-On Application Usability - Different Default Browsers
The Mac Sign-In Application provides Mac users with the same capabilities as that of their Windows counterparts. The Mac Sign-In Application, in addition to being a launch pad for the Business Productivity Online Suite, provides the ability to collect and submit user credentidals signing in to Microsoft Online Services, such as:
- Exchange Online e-mail
- Entourage 2004/2008/2008 EWS
- Outlook Web Access (Browser Based Email)
- Live Meeting
- My Company Portal
The My Company Portal link in the application has a requirement to use Safari 4.0 or higher in order to successfully log the user into an organization's SharePoint Online site collections without prompting for credentials.

If the user's machyine is configured to use FireFox as their default browser and they click the My Company Portal link, they will be taken to the Login.aspx page. They can click the Go Directly to the Company Portal button, however they must enter their Microsoft Online Services credentials when prompted:

If the user instead has Safari 4.0 or higher configured as the default browser, the user will be automatically directed to the MyCompany Portal with the user's credentials silently passed under the covers when requested, and the user is automatically signed into the MyCompany Portal without being prompted for credentials:
