I have an Office 365 subscription and I have started and run every one of the office products (for Mac 2011) and activated with my Office 365 account. However Outlook continues to ask for activation/sign-in every single time I start it up. And in addition the actual login page keeps saying that the site is unavailable and I have to keep retrying multiple times to even get to the point of putting in my credentials. This is extremely annoying. 

I have looked at the community postings on this and none of the postings help. All other office products including Word, Excel and Powerpoint work just fine. It is just Outlook that experiences this.