Mail continues to switch me to Outlook - how do I disable?

I don't know if the powers that be at Microsoft read this forum or not, but here's what I want to say to them.

Every single late night/early morning when I first launch mail, I get switched over to Outlook. I am legally blind. I use my computer for nonprofit organizations and when you people do this hostile takeover of my email program, it slows productivity. I bought this computer with the Windows Mail app. I don't like being forced to have to switch to a program I'm not familiar with! If you want to withdraw support for the application that's one thing, but to force it to no longer work and switch to another program is absolutely wrong. That's my 2 cents worth. I have downloaded another application for when you people force the issue at the end of the year. Outlook might be ok but I'm used to the Mail app and the way you folks are going about this is absolutely ridiculous. That's all. Good day and God bless!

Microsoft is a **** joke, I agree 100 %

I got fed up with this constant attempt to switch me to Outlook just to use the Calendar app and discovered that Mozilla Thunderbird, which is free and which I already have and use for my email, has a an even better calendar feature than Microsoft Calendar. So I copied all the recurring events from Microsoft Calendar then dumped Calendar.

A comment was made in this thread that some felt the software developers who created Calendar never use a calendar app. I feel the same way about Microsoft Word. Do any of the developers actually write? My guess is no.

Thanks I don't use the Calender much so that's not an issue. I pay for office 365 so I can use that. The problem is my that a 92 year old family member that piggy backs on my 365 account as allowed has always use windows mail the in built app that came with windows 11 10 and earlier. Microsoft take no account of very old peoples struggle with change and just keep changing things. Ie moving the start button and programs location on windows 11. I realise change is good but why not leave a "Classic" option for those that struggle. Microsoft are very thoughtless and have become more selfish in recent years. I have considered Thunderbird but in recent time MS have started bombarding people with non native apps to switch. MS is becoming more and more like a virus. If I was starting from scratch I would probably go for Linux.