I tried checking my mail this morning and saw this;
Beginning March 9, 2015, you will no longer be able to sign in, access your existing emails, or send and receive new messages using your Nokia Mail or Nokia Chat address. If you want to save your existing emails, you must copy your existing Nokia Mail to another email service or to your computer before March 9, 2015.
As an option, we invite you to create an Outlook.com email account. Once you have created an Outlook.com account, you can then import your Nokia Mail email into the account to preserve your existing Nokia Mail emails. You can learn more about this option here: http://nokiamail.com/migrate/outlook
We understand if you want to go elsewhere. You can also copy your Nokia Mail to another provider, or to your computer. Go to http://nokiamail.com/migrateto find out how.
If you have used Nokia Mail as your contact email for other apps or services, we advise you to update your profile on these services to use an alternative email address. We recommend that you let your friends and family know about your new email address as well.
To learn more please visit http://nokiamail.com/retire