Managing personal Outlook.com account settings, security, and privacy
Hi,
Welcome to Microsoft Community.
I'm happy to address your concern.
Please be informed that all Hotmail users has now been migrated to Outlook.com and the option to switch back is no longer available.
If you're currently having issues reading and replying to an email, kindly optimize your browser or use other browsers so we could determine if this is a browser related issue.
Some parts of Outlook might not work and it might not display properly if you're not using an updated browser. To get the best browsing experience in Outlook.com, please refer to article provided by Eugene.
Should you have any other questions or concerns, please let us know.
Thank you.