Updated: March 26, 2020

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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Updated: March 31, 2020

This article describes the Microsoft Office Outlook data file types and their default locations on Windows and Mac OS X.

What is an Outlook data file?

To put it simple, an Outlook data file is a file where Outlook stores your emails, tasks and other Outlook related information. A data file can be located on your local disk or on a network path.
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Updated: April 6, 2020

Sometimes, emails can get stuck in your Inbox, Outlook or Sent Items folder and you are unable to move or delete them, while Outlook reports an “unknown error”. This article describes various solutions to this problem.
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Updated: March 31, 2020

Well, the simple answer is that Microsoft removed the Diagnostics / Inbox Repair tool starting with Outlook 2010.

For Outlook 2000 and 2003, Microsoft included a Detect & Repair tool available from the Outlook Help menu. In Outlook 2007, this tool was replaced with the Office Diagnostics tool (also available from the Outlook Help menu). The Detect & Repair tool was supposed to check your Outlook installation and data files for errors / corrupted data.
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