This doesn't make sense. Mailbox only works with Gmail and iCloud Mail. Gmail supports OAuth2.0 [0] while iCloud does not [1,2]. On the other hand, Outlook sup

This doesn't make sense. Mailbox only works with Gmail and iCloud Mail. Gmail supports OAuth2.0 [0] while iCloud does not [1,2]. On the other hand, Outlook supports OAuth2.0 [3] and is not supported by Mailbox. Thus, even if the choice of the authors of Mailbox gave them some edge, it is surely not the one you described. [0] https://developers.google.com/gmail/xoauth2_protocol https://developers.google.com/gmail/xoauth2_protocol [1] http://stackoverflow.com/questions/18649352/is-there-an-icloud-web-api http://stackoverflow.com/questions/18649352/is-there-an-iclo... [2] http://www.iphonehacks.com/2014/01/apps-ask-icloud-password-privacy-threat.html http://www.iphonehacks.com/2014/01/apps-ask-icloud-password-... [3] http://msdn.microsoft.com/en-us/library/dn440163 http://msdn.microsoft.com/en-us/library/dn440163