>They did not have issues with his application of the Sherman Antitrust Act or relevant precedent, though.
I think they did. I'll give you a quote from the actual appellate opinion: "To establish a dangerous probability of success, plaintiffs must as a threshold matter show that the browser market can be monopolized, i.e., that a hypothetical monopolist in that market could enjoy market power. This, in turn, requires plaintiffs (1) to define the relevant market and (2) to demonstrate that substantial barriers to entry protect that market. Because plaintiffs have not carried their burden on either prong, we reverse without remand."
Naturally there is a context to that (and they didn't reverse everything the district court did, but some things) and you're invited to read the entire opinion if you're interested.[1] Incidentally, if there is one thing I've found Wikipedia to be regularly wrong or incomplete about, it's the content of court opinions.
Moreover, findings of fact are a distinct thing from conclusions of law. "Findings of fact" are usually decided by juries, but sometimes by trial judges when there is no jury, and it means deciding what actually happened, not deciding what the law is. For example, a finding of fact might be whether Microsoft did actually pressure OEMs not to bundle Netscape, but not whether or not having done that would be a violation of the antitrust laws, which would be a conclusion of law rather than a finding of fact.
(I should point out that we're having a nice theoretical discussion here and that this is not legal advice, and if you need legal advice you should consult an attorney.)
[1] Here is one freely available copy of the appellate opinion I found through Google: http://cyber.law.harvard.edu/msdoj/msft_ruling.html