Hmm, maybe my memory is slipping, but I don't remember the DOJ stepping in until Microsoft was accused of bullying computer suppliers.
Not sure how it all went down. I think Netscape sent a letter to the DOJ detailing many of the issues you mentioned and that prompted the DOJ to re-open an anti-trust case against MS.
Here's an interesting summary. Just a few pertinent tidbits. Obviously this isn't remotely on the same scale as the Netscape case,
"Consumers and computer manufacturers should have the right to choose the software they want installed on their personal computers," said Attorney General Janet Reno. "We are acting to preserve competition and promote innovation in the computer software industry."
"This action will protect innovation by ensuring that anyone who develops a software program will have a fair opportunity to compete in the marketplace," said Joel I. Klein, Assistant Attorney General in charge of the Department's Antitrust Division.
Justice Department Files Antitrust Suit Against Microsoft for Unlawfully Monopolizing Computer Software Markets
One other fun link:
"Now it looks like the first official investigation into Apple’s business practices is about to be underway, courtesy of the U.S. Federal Trade Commission, who has completed negotiations with the Department of Justice to examine whether Apple’s limitations on [COLOR=blue ! important][FONT="][COLOR=blue ! important][FONT="]software[/FONT][/FONT][/COLOR]
that can be submitted to the App Store unfairly harms competition."[/COLOR]
Wall Street Journal: FTC Launches Investigation into Anti-Trust Claims Against Apple | Cult of Mac