Save money by not having to comply? That's not how I read this.
I read it completely differently.
Right now the government uses it's secret courts to create court orders that demand that MS hand over things, all the while the user has no idea.
This suit appears to be a demand on the part of MS to be allowed to tell whomever the account belongs to that the government has requested/required this information.
Right now if you're being investigated, you might have no clue. And while I understand how this is good for case building as it doesn't give a heads up to the bad guys so they have more time to hide, but it's been shown time and time again how the government gets it wrong and good people end up in bad places because of mistakes by the government. So the sooner you are made adware of things like this, and you've done nothing wrong, the sooner you can start solving any problems that brought you to their attention in the first place.