Not another email client, but another webmail service.
GMX - Global Mail
Exchange
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.
