Exactly a year ago, Microsoft launched the preview of Outlook.com, and on Wednesday the company is looking back and celebrating how far it’s come. In fact, Microsoft has revealed it has made over 600 additions, changes, and improvements to the service thanks to 34 feature releases in the last 12 months. The biggest driver of these tweaks, according to Microsoft, has been user feedback, in addition to all the usual focus groups, research, events, and blog comments. Compared to Hotmail, Outlook.com far more prominently places user-feedback requests, and as a result the average number of monthly feedback submissions for Outlook.com is about 50 times what Microsoft used to receive with Hotmail. Dick Craddock, Outlook.com’s Group Program Manager, revealed how Microsoft handles all this data.