You can download the update directly on your device through the Windows Store or by using the link which follows:
Yahoo Mail for Windows has the following new features and improvements
- Support for multiple Yahoo! accounts: users can now add multiple Yahoo! accounts in order to get a consolidated view of all their Yahoo! email. To do so, open the Charm, select Settings | Accounts and click on 'Add a Yahoo! Mail Account.'
- New languages support: Dutch, Danish, Finnish and Norwegian
- Overall performance enhancements and bug fixes