> To prevent the CSS of emails to affect the style of the webmailer, Outlook modifies the email by prefixing all ids and classes with x_ and adjust the CSS acco

> To prevent the CSS of emails to affect the style of the webmailer, Outlook modifies the email by prefixing all ids and classes with x_ and adjust the CSS accordingly. Wait what, OWA loads emails directly into the same DOM tree as the rest of the app instead of an iFrame?