This option controls which address book you see when you open the Address Book (via clicking Ctrl+Shift+B) and when you click the To, Cc, or Bcc buttons when composing e-mails.

This tip shows how to delete holidays and events from your calendar. See also How to add country holidays to the calendar and How to add custom holidays to the calendar.

If you have Exchange, Microsoft 365, or Outlook.com account, you can permit other people to view all or some details of your events, edit events, and delegate permissions. Though, you cannot distribute schedules to the email group or distribution list. External users who are not part of your organization and those who do not have Outlook also become a problem that the standard sharing method does not address. Instead, you can email a static copy of your agenda for a specific date range as an attachment.

This tip shows how to open the Calendar sent to you.

There are several Outlook startup switches. The most common switches are listed in this tip.

This tip shows how to create and add custom holidays, for example, of your company to the Outlook calendar.

This tip shows how to add holidays of your country or any other country to the Outlook calendar. See other tip how to add custom holidays to the calendar.

By default, if Reading pane is opened, Outlook opens replies and forwards in the same window, but you can fix this behavior and open them in a new window.

Outlook rules could be exported and imported from file. E.g., you can export rules to a file, send this file as an email attachment or place it on a network share (or a local share) for backup purposes or to allow other users to access it.

If you are waiting for the important email from someone or need to be informed when your boss sends you an email, create an alert rule and give a rest to your brain. You will be informed promptly by alert as soon as Outlook receives such kind of email.