The latest refrain came Wednesday in a blog post by Dave Heiner, Microsoft's deputy general counsel. His attack amounted to a last-ditch appeal to the U.S. Federal Trade Commission and the European Commission as they wrap up wide-ranging investigations into Google's business practices.
Resolutions to those probes are expected early this year, perhaps within the next week at the FTC.
Microsoft fears Google, perhaps its biggest nemesis, will emerge from the antitrust probes without being required to make significant changes.
"Hopefully, Google will wake up to a New Year with a resolution to change its ways and start to conform with the antitrust laws," Heiner wrote. "If not, then 2013 hopefully will be the year when antitrust enforcers display the resolve that Google continues to lack."
For the past two years, Microsoft has been among the companies marshalling a campaign aimed at persuading regulators to force Google to changes its ways. Among other things, regulators have been looking into allegations that Google has been highlighting its own services in its influential search results while burying links to competing sites.
The investigations also have delved into the way prices are set in Google's digital advertising system, the Internet's biggest marketing vehicle, and examined whether Google has been refusing to license key patents to mobile devices vying against gadgets powered by Google's free Android software.
Heiner mostly rehashed complaints that cast Google as a conniving company that abuses its dominance of Internet search, as well as its leadership in online video and smartphones, to thwart its rivals to the detriment of consumers.
Google Inc. has steadfastly maintained that it hasn't done anything wrong while trying to give people better access to the information and other services they want.
In an attempt to make his case, Heiner focused on previously aired allegations that Google has cut off Microsoft Corp. from the data it needs to improve the YouTube viewing experience of Windows smartphones users.
YouTube, which is owned by Google, hasn't designed a Windows Phone application for its popular video service. Microsoft views the snub as a calculated attempt to lessen the appeal of Windows Phones as they try to challenge Apple Inc.'s pioneering iPhone and the wide array of smartphones relying on Android. The YouTube apps designed for the iPhone and Android phones have become staples on those devices.
As a counter-measure, Microsoft has been trying to build its own YouTube app for Windows Phones for the past two years, only to be blocked by Google's refusal to license vital coding information, according to Heiner. YouTube's own leadership wants to co-operate with Microsoft, Heiner wrote, but those executives were overruled last month by their bosses at Google.
"Google's refusal deprives consumers who use competing platforms of a comparable experience in accessing content that is generally available on the Web, almost all of which is created by users rather than by Google itself," Heiner lamented.
In a statement, Google denied Microsoft's claims and stressed that all of YouTube's features are available through mobile Web browsers. "We've worked with Microsoft for several years to help build a great YouTube experience on Windows phones," Google maintained.
Limiting YouTube access to mobile browsers apparently wasn't good enough for Google on the iPhone. Even before Apple dropped YouTube as one of its built-in applications when it released a new iPhone operating system in September, Google had released an alternative to fill the void. The new iPhone app ensured users wouldn't have to visit YouTube through a browser.
Google also offers a YouTube app for Microsoft's Xbox 360 video-game console, which comes with an Internet connection that makes it easier to watch online video on television sets instead of the much smaller screens on computers and smartphones.
Microsoft Corp. wrangled with antitrust regulators for much of the 1990s in legal battles that focused on whether it was using its pervasive Windows operating system to squelch other software alternatives. The company ultimately had to make several concessions while keeping most of its business intact, but the regulatory fight proved to be a major distraction that diverted management's attention just as Internet search was helping to turn the Web into a hotbed of data, entertainment and technology. Google helped to orchestrate that shift over the past 14 years, providing it with the means to branch into smartphones and other fields while Microsoft's growth has slowed amid the upheaval.