Just a quick update, after using and getting to know Office 365 over the last week, I have discovered the the site wide navigation is not always consistant. Upon entering some parts of the site the top level navigation does not exist and from a users perspective this can be very frustrating. Yes, the browser navigation buttons are available but often with a web application they can have unexpected results or not even function at all. Not a major issue at this stage, but something to bear in mind.
Inconsistant Navigation
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