Apparently the "donation" was free licenses for microsoft products, which they give to non-profits.
"As part of that programme the organisation requested free software licenses, and Microsoft provided them, just like we do for thousands of other eligible non-profits every year," Katie Stainer, a spokeswoman for Microsoft, said in a statement.
"Microsoft's position on climate change remains unchanged. Microsoft believes climate change is a serious issue that demands immediate, worldwide attention and we are acting accordingly. We are pursuing strategies and taking actions that are consistent with a strong commitment to reducing our own impact as well as the impact of our products.
"In addition, Microsoft has adopted a broad policy statement on climate change that expresses support for government action to create market-based mechanisms to address climate change."
Good to know :)