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A Microsoft Office 365 Advisor since 2009 Microsoft users since 1985
Information Technology Takes a  web site is our messaging site for Office 365 
Only Microsoft Office 365 Subscription Advisors can offer trials and Purchase Offerings 
You don't need to install anything in order to use Office 365
All Office 365 products, are paid for on a subscription basis, monthly or annually. 
With a subscription, you’ll always get the latest version — Office 2015, Office 2031, Office 2119 etc etc etc
You can download and run the Office programs on up to 5 computers, including Macs and PCs. You can change which 5 they are at any time. 
Office 365 FAQ   Payments are Made DIRECT to Microsoft with a Credit Card   Office 365 FAQ

Legacy page this information was for BPOS which is Now Office 365 

The Sign In Application

The Sign In application is designed to work closely with Microsoft Online Services to deliver an integrated, single sign-in experience. If you install and use the Sign In application, you will have uninterrupted access to all services that your company has assigned to you. Using Microsoft Online Services without being signed in through the Sign In application is not supported by the Microsoft Online Services Support Team.