Welcome to Nokia Support Discussions! Here you can share advice and tips with thousands of other Nokia users around the world in English. Many Nokia employees also follow and participate in the discussions, see our guidelines for more information. Everyone can search and read the discussions, but to post your own question or reply to others, simply sign in with your Nokia account. If this is your first time here, you can choose an alias to represent you. And if you don't have a Nokia account yet, please register.
In certain regions, "Windows Live" client will be available in the "Download" app. Could you check it in your E90? if available, you can install it and configure it. This will be integrated with the native email client.
However, this does not support polling for new mails or any push capability. You will have to manually synchronise the mail if you want to check for new mails.