I've been looking for an answer to this for weeks and figured I might just ask the question directly.
I'm using Thunderbird 102.6.1 on Windows 10. I'm looking to replace the "standard" Thunderbird agenda popups (see screenshot below) with a "native" system notification such as for Windows 10 Calendar (see 2nd screenshot below). This is mainly because the TB agenda popup steals focus from other apps and I often end up typing on that window instead of the one I was previously writing on, which is frustrating.
I know this is possible for email notifications and I've already enabled that in the TB options, however I couldn't find the equivalent for agenda alerts.
Thanks in advance for your help! Cheers