With the default email setting, Mail Windows 10 will sync your email for the past 3 months. Click the Add to Favorites option Make Windows 10 Mail download all emails Right-click a folder and then click the Add to Favorites option to add it to the left panel. Step 2 : Click the More link to see all folders. Step 1 : In the left panel of the Mail app, click on your Gmail account. To add other directories like Drafts, Spam, Sent Mail and Trash to the left panel, do the following: To view all folders, you need to click on the More option. With the default settings, the Mail app does not display all folders in the left panel. Step 8 : On the left panel of the Mail app, your Gmail address will appear. Step 7 : Finally, click the Allow button and then click the Done button to start syncing your Gmail account. Step 6 : If you have enabled two-step authentication for your Gmail account, you will be asked to enter a verification code. Step 5 : Enter your Gmail account password before clicking the Next button. Step 4 : Enter your Gmail account address. Clicking on the Google icon will display the new Google login page. Skip this step if you clicked on the Add account option in Step 1. Step 2 : Next, click the Add account option to open the Add an account dialog box.