There are many different types of email accounts you can add to Outlook, including Microsoft 365, Gmail, Yahoo, iCloud, and Exchange accounts.

Some third-party email providers, like Gmail, Yahoo, and iCloud, require you to change some settings on their websites before you can add these accounts to Outlook.

Outlook for PC- Windows Setup

These steps are the same whether you're adding your first email account or additional email accounts to Outlook.

1. Select File > Add Account.

   Open

   

   
   2. Enter the email address that you would like to setup and click Connect
   
   

   Open

   

    

3. If prompted, enter your password again, then select OK > Finish to start using your email account in Outlook.

That’s all-you have successfully setup your email account in your desktop outlook.

Outlook for Mac

Add a new account quickly

ost email accounts, including Microsoft 365, Exchange server accounts, Outlook.com, Hotmail.com, Live.com and Google accounts can be set up in a few quick steps.

1. Select Outlook > Preferences > Account.

2. Click the plus (+) sign > New Account.

3. Type your email address > Continue.

   
   
   

4. Type your password > Add Account. (Your screen might look different from this one depending on the account you're adding.)

5. Select Done to start using Outlook 2016 for Mac.

That’s all-you have successfully setup your email account in your desktop outlook.

Reference:

Add an email account to Outlook - Office Support (microsoft.com)