The Difference Between Office Outlook Add-ins and Apps
First of all, it’s important to clarify that Microsoft currently markets two (very) different Office versions: Office Professional and Office 365.
Office Professional is actually the “old” desktop Office version (the one that everyone is familiar with, for many years), while Office 365 is the web version (or cloud version) of Microsoft Office. Microsoft Office 365 (initially called Office Online or Office Live) was actually around for some years too, but – with the release of Windows RT for Surface & other mobile platforms – it will become more and more popular. Some Office 365 subscriptions also include the desktop Office application versions, such as Outlook or Word – to avoid further confusions, in this article we refer to Office 365 as the web based version.
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