There are several different ways to sign out of Outlook, depending on whether you are using Outlook Desktop App or the web version of Outlook. Through this article, you will learn how to proceed in both cases.
Steps
Method 1 of 3: Quit Outlook on Computer

Step 1. Exit Outlook
Select the Outlook window and press alt = "Image" + F4 to exit the program.
Click here if you would like to switch to a different account in Outlook or have Outlook ask you for your username and password
Step 2. When Outlook is closed, it means that you have logged out of Outlook
Method 2 of 3: Sign out of Outlook on the web

Step 1. Open Outlook in a web browser
The Outlook on the web address is www.outlook.com.

Step 2. In the upper right corner, find your name or username and click on it

Step 3. Click Exit
The next time you use Outlook for the web, you will need to provide a username and password.
Method 3 of 3: Switch to a different account in Outlook
Before switching to another email account, you will need to create one.

Step 1. Open the "Control Panel"
If you are using Windows 7, you need to click on the "Start" menu and then select "Control Panel". In Windows 8, you need to open the start page, and then find "Control Panel" on it.

Step 2. In the sidebar, find User Accounts and Family Safety, and then click Mail

Step 3. Add a new profile to Outlook
In the Mail Setup dialog box, click the Show button, and then click the Add button. Enter a name for the profile. Click OK.

Step 4. Set up your email account
Fill out the information for the new email account. If you need help, contact your ISP or Outlook administrator.
Popular free email services such as Outlook.com, Google, Yahoo! or iCloud have detailed help on how to set up an account - refer to your email service website

Step 5. Configure Outlook to prompt for the profile to use when opening
In the Mail Setup dialog box, click the Prompt Profile button to use the radio button to select a profile.

Step 6. Click OK
The next time you open Outlook, the program will ask you to choose which email account you want to use.