Email, Messaging, & Video Calls Email How to Build a Windows Mail Address Book Automatically Take a hands-off approach to populating your Contacts by Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated on March 30, 2019 Rolodex. © Ged Carroll; CC BY 2.0 license Email Yahoo! Mail Gmail Tweet Share Email You may have the best of intentions of building your address book so you have the addresses of your friends and business partners when you need them, but if you've been procrastinating, you may benefit from a helpful feature in Windows Mail. Whenever you reply to somebody via email, Windows Mail can add the recipient to your address book automatically. It's an easy way to build a comprehensive list of contacts. Build Your Windows Mail Address Book Automatically To have people to whom you reply added to your Windows Mail Contact list automatically: Select Tools > Options... from the menu.Go to the Send tab.Make sure Automatically put people I reply to in my Contact list is checked.Click OK. Note that recipients are not added to your contacts when you start a new message and address it manually. The original senders are turned into address book contacts only when you reply. Where Are the Contacts in Windows 10? If you can't find your contact list in Windows 10, look in the People app. This is where Windows Mail stores all its contact information. To view the contacts associated with your accounts, select the Switch to People icon to open the People app. It is located on the lower-left side of the window next to the Switch to Mail and Switch to Calendar icons. Make Windows Mail the Default in Windows 10 Windows 10 ships with Windows Mail but it may not be set as your default email program. To change the default to Windows Mail: Select the Start button. Type Default app settings.In the Web Browser section, select the current browser and then select Windows Mail.