... I was informed ... almost 3 years ago ... Microsoft stopped support for Windows Live Mail.
Perhaps you're referring to the disinformation campaign mounted before the last few hundreds of thousands of accounts were migrated from outlook.com to Outlook Mail. You may be interested to read what I
had to say about this campaign then: Migration of Outlook.com
accounts to Outlook Mail
The MS propaganda machine then announced that support would end on 17 January last year. There wasn't then and hasn't been since any explanation of what this entails; the fact is that there was no change at all.
There are no more security updates ...
Yes, that is the usual explanation of what stopping support means. However, since Windows Live Mail was first released in 2006 (that's getting on for twelve years ago), there has never to my knowledge been
a single security update. This being the case, I don't think users will miss them ...
... eventually someone will find the weaknesses for intrusion.
Why would anyone look? There was a security update a few years ago for Windows Live Writer, to plug a vulnerability that hadn't ever been exploited, as far as I can remember. Writer is designed to interact
with websites, and so is open to the sort of attacks that interaction can facilitate. Windows Live Mail is (among other things) a simple mail client using protocols tried and tested over decades.
I ... had to start using Outlook online as WLM would no longer send or receive emails.
This was almost certainly because you were trying to use the DeltaSync protocol that the Outlook Mail servers aren't provisioned for. There was no change in the program; you simply had to use different
account settings. Again, you might be interested in the article I wrote about this in June 2015 (before Windows 10 was released, you will note):
Windows Live Mail and Outlook Mail
You haven't explained why Windows Live Mail poses a bigger security risk for personal information or a bigger risk of malware infection than other mail clients available to Windows users. These things are secured by mechanisms external to the program - by
Windows and third-party software, and by safeguards built-in to the communications protocols in use. Much of the 'personal information' stored in your webmail account is protected solely by a single password, and we all know what that means.
I would like you please to admit that you have no basis for the statement I quoted in my earlier reply to you.