Well, the mouse is still squeaking but it's control software doesn't work. Not a big surprise as the installer was last updated in 2011 but it was working fine in 10.10. Reinstall doesn't help. I guess I'll look into USB Overdrive finally.

broke and Microsoft in the same statement;
yeah, nothing unusual there

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39°36'17"N 75°44'43"W

DuckDuckGo
The search engine that doesn't track you.

DemComm Records 2021 Greatest Hits
includes:
Taxman by Joe & Nancy's Rich Ice Cream Band
The Humpty Dance by The Harris-Brown Hookup
Lets Spend The Night Together by The Fang-Swalwell Gang
Díaz-Canel Is A Friend of Ours by The AOC Squad
My Old Kentucky Retirement Home by MitchMcC & The Soggy Boxer Boys
Burning Down The House by Merrick & The Goons
Back In the USSR by Bernie's Red Square Trio

Heh, Ok I installed USB Overdrive after putting it off for about a decade and a half. Works great!

Thanks for taking one for the team.

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Saint Cloud, Minnesota, where the weather is wonderful even when it isn't.

FWIW, there's a fix for the SM Mouse Intellipoint software here:

[answers.microsoft.com]

Scroll down to Matt Bovett's reply on Oct 1.

I used a Microsoft mouse with my Macs for well over a decade and never installed the Microsoft driver.

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It is what it is.