How to Activate my Hotmail Account?

I hate the outlook format that is implemented on my hotmail account , how can I have it back to how it was before

Hi Diane,
<br />Thank you so much! I thought all my data was stored locally in my .pst file, but apparently Outlook did use a Microsoft Exchange Server. I logged on to Outlook Live through my regular Microsoft account, using an email address that is neither a Hotmail nor an Outlook.com address. But when I am logged on to Outlook Live, it does show an outlook.com address, which I don't remember ever creating and which consists of seemingly random letters and numbers. Now I don't know how to add this account to my local Outlook...
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Rasika M, thank you for the feedback.

How did you install Office 365 to your PC?

How did you receive confirmation of this purchase?

That email ID that receive the purchase confirmation, use that email to activate Office or contact Lenovo Germany support to give you directions on how to install and activate the subscription you purchased from them.

There appears no other account then my hotmail-account. There is nothing else.
<br />The App section just leads to the settings of my microsoft account in my browser. There I already searched unsuccesfull.
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Hi,

thanks for your answer Eniko.
That is the way how to do for the desktop software.
I would like to change my Sending-Name in the Outlook Android App, especially for my Yahoo-Account what I connected to the App.

Regards, Klaus