Hi!
Here is how to fix 'Outdated Settings' error in Windows 10 Mail app...
Windows 10 mail app can be tricky! Here is an article with the answer on how to fix the 'Outdated settings' issue!
http://windowsreport.com/account-settings-out-of-date-windows-10-mail-app/
Transferring your emails to Windows 10 mail app...
When you add your email, it should automatically sync your emails. Workspace Web mail does not give the capability to create a backup file of your emails. If you want a more reliable email , then I would go with an Office 365 email. That way you dont have to configure any ports, servers, and it will seamlessly sync across all your devices.