The latest news is that Microsoft has published a new support page on this issue, stating that your mouse pointer can ...
Microsoft is investigating a known issue that causes the mouse pointer to disappear in the classic Outlook desktop email ...
A bug in classic Outlook hides the mouse pointer, making navigation difficult.
Microsoft notes that a disappearing mouse cursor may also be observed in OneNote and other Microsoft 365 applications, but that classic Outlook is affected the most.
Ergonomic mice are often cited as the best way to reduce wrist pain for desk workers and gamers, but there's more to it than simply buying a new mouse.