Hotmail is one of first web-based free email service founded in 1996. The Hotmail.com was introduced by Microsoft as Outlook.com with more features like unlimited storage & ajax with interface closely related to Microsoft Outlook. Outlook.com provides integration with Calendar, SkyDrive, People and Skype. This integration and with added features, the users of Outlook.com (then Hotmail.com) has increased to 380 millions and still growing.
But old users using Hotmail account with @hotmail.com, @msn.com or @live.com email address are automatically upgraded to Outlook.com account with its new features. So now, whenever the user enters www.hotmail.com in an address bar, it will be automatically redirected to Outlook.com sign in page instead of Hotmail.com sign in page. But users can sign in to Outlook.com with existing email address from Hotmail account and get their inbox, outbox and other folders there with new interface. They just have to get used to this new interface. Many users may feel a bit disappointed due to this sudden change. Anyway, Outlook.com is lot more powerful than Hotmail.com due to its various integration and there is no fundamental change in sending and receiving emails process but this transition may be difficult for many users to adjust first. Being considerate, Outlook.com has option for old users with Hotmail.com to switch back to Hotmail experience.
The user unfortunately can’t do Hotmail login without Outlook now but the option of switching back to Hotmail with old interface give users more choice. The user can switch back to Hotmail experience from Outlook.com. For this switching, first you should sign in from Outlook.com with your old Hotmail email address. Once you logged in, find settings icon in top right corner before username and click it. There is option of ‘Switch Back to Hotmail’ in bottom of drop-down menu. Select that option and you can leave feedback to Outlook about why you are switching to Hotmail. But this might be outdated in many accounts. So consider this.
If your mind changed and want to have new experience with Outlook.com, you can upgrade to Outlook.com switching back from Hotmail in same way. Most of the users find this transition acceptable as well because the users do not have to create new account with Outlook.com if they already have Hotmail account. You can change your @hotmail.com to @outlook.com. Though new email users do not get to open Hotmail.com as it is entirely become Outlook.com now. So for existing users with Hotmail email address, they will not be able to do Hotmail login without Outlook. But its not a great deal as any link associated with then Hotmail will automatically redirect you to Outlook.com.