Not another email client, but another webmail service.
Looks wise, it's really quite similar to Microsoft Outlook, the email client that comes with MS Office.
Features wise, I won't say it would lose to MS Outlook. You can check all your accounts, Gmail, Yahoo! Mail, Hotmail, etc by using Mail Collector.
Storage wise, you have 5GB. But you could send up to 50MB of attachments.
A screenshot.