Mozilla Thunderbird, the popular email client for Windows and Mac, can support multiple email accounts. This is a great feature if you want to keep separate email addresses for work, personal, and other accounts. To set up multiple email accounts in Thunderbird, open the application and click on the menu bar at the top of the screen. From here, select Tools > Accounts. You will see a list of all your current email accounts. To add a new account, click on the plus sign next to the account you want to use. Once you have added an account, Thunderbird will ask you to enter your login information. You can then select which folders should be synced with this account and whether or not you want Thunderbird to automatically send messages from this account to other devices connected to your computer. ..