In its present state, it doesn’t sound like the Premium version of Outlook adds enough value to justify the subscription price. It will be interesting to see if additional capabilities are added as the service evolves.
Microsoft revealed Outlook.com Premium, a subscription-based version of its free Outlook.com email offering earlier this year. Back then, the offer was only available to select customers who took part in the beta test. The company appears to have opened the doors for sign up to Outlook.com Premium to the public recently.