Outlook isn't all that complicated to use once you figure it, but trying to explain how to do something in Outlook often takes longer than just showing how to do it.
Many of these tutorials area also available on Slipstickcom's YouTube channel.

View a Two Week Calendar
You can select 2 or 3 weeks in the navigation calendars and view those weeks in a monthly-style grid. This trick works on all versions of Outlook. To change the number of weeks in the calendar view: Start with any Day/Week/Month view Drag the mouse over the dates in the navigation calendar to select up

How to Create a New Profile
How to create a new profile in Outlook 2007, 2010, 2013 and set it to use an existing pst file.
How to Uninstall Outlook from an Office Installation
How to uninstall Outlook without uninstalling other Office applications.

How to move IMAP data files
How to move an Outlook pst file used by an IMAP account or the ost file used by Outlook 2013 IMAP and EAS accounts. . Instructions include steps to move the pst or use the ForcePSTPath registry key.

Online Services in Outlook: Gmail, Yahoo, iCloud, AOL, GoDaddy
How to configure email accounts in Outlook, including Gmail, Hotmail, Godaddy, and Yahoo email. We have a list utilities that work with some web-based email services.
Add Holidays to Second Outlook Calendar
As many users have discovered, Outlook's Options > Calendar Options > Add Holidays only adds the holidays to the default Microsoft Outlook calendar. Many users wonder how they'll get the Holidays on the other calendar. It's easy - add the holidays to the default calendar then move or copy them to the other calendar. Outlook

Open Hyperlinks in an Outlook Email Message
Use an Outlook macro to open every hyperlink in the selected email message. A version of the macro will open hyperlinks in every message in the selected folder.
Sync LinkedIn Contacts with Outlook desktop
In the People section of Outlook.com, I linked my Gmail, Twitter and LinkedIn contacts. I do not store any Outlook-only Contacts there, they are all linked. I'm syncing to Outlook but none of these linked People are syncing across.

How to Show the Sender’s Email Address and Reply Time in Outlook
How to show the sender’s e-mail address and other fields in a column in message list view. Many Extended MAPI properties are added to messages when they are committed to Outlook message store or the Exchange mailbox but Outlook doesn't have a built in way to expose the value. You can view them using a custom configuration form that exposes the value in a custom field.

How to Create HTML Stationery for Outlook
How to create custom stationery in Outlook and where to save it so Outlook can find it.

Outlook hangs while opening messages
A bug in Outlook allows a malformed "web bug" url to bypass the blocked external content setting. As a result, content that would normally be blocked by the Block External Content may be downloaded.

Using Outlook's New Contact Cards
How to customize the look and behavior of Outlook's new Contact cards. For Outlook 2010 and Outlook 2013.