Office 365's biggest problem is how easily it is to become lost while navigating and not be able to get back to a different part of the suite. Depending on where you are at the moment, there may or may not be sitewide navigation. For example, when you're building your Web site, there's no navigation away from the site-building tool; you have to use your browser's back button to get back to wherever you were before you started building the site.

Similarly, when you're building a team site using SharePoint tools -- for example, on the page setting permissions -- you can directly navigate only to certain portions of Office 365, and you have to use your back button more than you want. It's also easy to become lost and forget exactly where you came from, because there are often no clues about where you've been. You'll find similar problems at other places as well, such as when you're managing groups in the Exchange administrative tools section.

This gives Office 365 the feel of a group of separate apps and services that are only partially integrated; the suite is essentially a collection of existing services with only some common navigation. Keep in mind, however, that Office 365 is still in beta; the navigation and other issues may be fixed when the final version is released.

Office 365 is certainly more powerful than its chief competitor, Apps, but more difficult and confusing to use as well. And Office 365 would likely be overkill for some businesses, especially smaller ones. Still, for companies that need all of its power and are willing to put up with sometimes frustrating navigation and a potentially long learning curve, it can be a worthwhile productivity-booster and money-saver.