Mozilla Corporation may have enough money, but they don't develop Thunderbird. If you used the donation form on this page, you didn't donate to Mozilla Corporation, but to the company developing Thunderbird. So all is fine.

>I once donated to Wikipedia - and they have billions I heard

I had no idea one way or the other, but if I'm reading this right [1] they are around $150MM currently for their endowment. Mozilla, meanwhile is actually around $1.2 billion and counting. But I think that makes sense for both, Wiki has the strongest donation drive in the world, and Mozilla is much more exposed to risk and in need of its firewall.

I don't think it changes anything, they're both good donation targets and Thunderbird is separately financed anyway so they still benefit from the $$ but I was surprised to see Wiki with the lower endowment.

1. https://foundation.wikimedia.org/w/index.php?title=File%3AFY...

The reason Wikipedia has so much is that the end goal is for it to be self sustaining through interest iirc

I'm just using Evolution. Switched from Thunderbird a few weeks ago. So far, so good.

Mozilla and Mozla are two different corporations though both under the mozilla foundation.