Yahoo has a built-in account switcher: you can add up to 10 Yahoo accounts and move between them without signing out, on the web and in the Yahoo Mail app. If your other addresses are Gmail, Outlook or AOL, Yahoo Mail can also add those mailboxes so you read everything in one place. The switcher shows one account at a time, though. If you want two Yahoo Mail inboxes open side by side, each in its own window, WebCatalog Desktop is the better fit.
Switch between Yahoo accounts on the web
According to Yahoo's guide to adding and switching between Yahoo accounts:
- Sign in to your first Yahoo account.
- Point to or click your profile picture and select Add or Manage accounts.
- Click Add account and sign in with your other Yahoo account.
To switch, click your profile picture again and choose the account you want. You can add up to 10 accounts this way.
Add accounts in the Yahoo Mail app
On your phone, tap the Profile icon, then Manage Accounts > Add Account, and sign in with your other Yahoo email address. The same help page, Add or remove email accounts in the Yahoo Mail app, also covers signing out of an account you no longer need.
Read Gmail, Outlook or AOL mail inside Yahoo Mail
If you'd rather keep a single inbox, Yahoo Mail can add mailboxes from other providers. On the desktop site, click More, choose Settings > Mailboxes, and select Add mailbox under the mailbox list. Then pick the provider and sign in to give Yahoo access, as described in Manage and switch mailboxes in Yahoo Mail. In the app, tap the Profile icon and choose Add another mailbox.
This works well when Yahoo is your main inbox. It isn't the same as keeping the accounts separate, since everything is read and sent from one Yahoo Mail session.
Keep Yahoo Mail accounts side by side with WebCatalog Desktop
WebCatalog Desktop (macOS, Windows, and Linux) turns Yahoo Mail into a desktop app with its own window and Dock or taskbar icon. With profiles, each Yahoo account keeps its own cookies and session, so you can open a personal inbox and a business inbox in two windows at the same time instead of toggling between them.
- Install WebCatalog Desktop and add Yahoo Mail from the catalog.
- Open Profiles, select Add profile, and name it, for example Personal.
- Open Yahoo Mail with that profile and sign in with that Yahoo account.
- Add more profiles, such as Business or Shopping, and sign in to the matching accounts.
See Create and manage profiles for more detail. A profile can be reused across apps, so your Business profile can also open Yahoo Calendar with the same account. To keep each set of apps together, put them in spaces, such as a Business space and a Personal space. Spaces organize your apps, while profiles keep the logins separate.
WebCatalog Desktop doesn't merge inboxes. If you want all your mail in one list, Yahoo's own Add mailbox option is the right choice.
Conclusion
For occasional checks, Yahoo's account switcher is all you need. To keep several Yahoo Mail accounts open at once, each in its own window, download WebCatalog Desktop.
