By default, Outlook uses the AutoComplete list to suggest email addresses. If the AutoComplete feature is not disabled in Outlook (see how to turn it off), the AutoComplete list is updated automatically after sending an email. From time to time, people make mistakes when entering addresses or receive incorrect addresses for use.

The AutoComplete feature generates an AutoComplete list, also known as the nickname cache. This list is generated automatically after sending email messages from Outlook:

Users of Microsoft email services are well acquainted with the OST format, which is used to store data in encrypted form. Converting OST files allows you to get rid of format restrictions, after which mailings will become available to the user for offline work in Outlook.

The standard Outlook work weekdays are Monday-Friday, and work hours are 8:00 AM - 5:00 PM. The Scheduling Assistant uses this information to show your availability when someone wants to schedule a meeting with you. Skype for Business can forward your phone calls to an alternate phone using this information.

Microsoft automatically creates the address book when you create a Personal Folders profile, but only one address book is added to the profile. Sometimes you need two or even more different address books: for the projects, relatives, hobbies, etc. Fortunately, you can easily create additional address books out of the profile for different needs.

Stationery provides an easy way to create a visual Outlook template with custom background color and image, fonts, bullets, colors, and effects. Unlike an email message template that includes both visual appearance and text, the stationery consists of visual appearance only. The default stationery applies to new emails, replies, and forwards. Thus, if you need an Outlook template for branded messages, you should use the custom stationery instead of the email template.

After creating and sending a meeting request by email, the organizer needs to know the status of responses, and the total number of people accepted, declined, or stated their tentative status for the meeting. You can quickly check these numbers in the Calendar view.

After recent updates, the ribbon in Microsoft Outlook can take up to 1/3 of the available screen space. Microsoft Office help tells that you can hide or unhide your ribbon, but you cannot reduce the size of your ribbon, or size of the text or the icons. False! You can change the mode and remove unnecessary white space around buttons, and, thus, reduce the ribbon size.

If Outlook does not open your data file, or you can not find some items in your inbox, contacts or calendar, then your PST is apparently corrupted. At this moment, thought about backup comes to your mind, but it is too late to muse about a backup. You need to backup your Outlook data in advance. Otherwise, you will need a repair tool.

For some Outlook messages, it can be useful to add Voting to collect your colleagues' or friends' votes (see How to add and use voting button in Outlook).