In an environment like this, and we talked a little bit about it last quarter, we do feel really good about the value proposition of our content in past challenging economic times. Brian, thank you for the question.
And so there’s a lot for players and fans in the Diablo community to look forward to.
In-app revenue growth moderated during the quarter, but remained positive throughout while advertising revenues reaccelerated throughout the quarter.Operating income was $212 million, again, the highest since the acquisition with an operating margin of 38%, four percentage points higher year-over-year. So that's one really important vector that we're focused on. We're seeing really strong momentum with the title, the game's now surpassed over 250 million downloads globally, and it just keeps on tracking for us.Over the past several months, the team has made really great progress on adding great new content for the community and then also in optimizing the engagement, the retention and the in-game economy to make sure we're working on all components. Of course, we’ll continue to support our existing initiatives. Any reproduction, redistribution or retransmission is expressly prohibited.Novavax (NASDAQ: NVAX) reported a loss of $17.5 million or $0.30 per share for the second quarter of 2020. Now at the heart of this ad business is our platform, which provides a fully controlled safe environment for brands. Blizzard will launch its latest Hearthstone expansion, Scholomance Academy, on Thursday this week, and through the quarter, we'll continue to support other key franchises with in-game content. And so there is a great potential for players in all regions to really love the game. Operator? And for Q&A, Rob Kostich, President of Activision; J. Allen Brack, President of Blizzard Entertainment; and Humam Sakhnini, President of King will also join us.I would like to remind everyone during this call we will be making statements that are not historical facts. The WoW and the Hearthstone teams continue to bring lots of content to the community, and this is important for both of these games going forward. Let's conquer your financial goals together...faster. We’re really fortunate to have a passionate and engaged community that’s really looking forward to what we are creating and what we’re working on and we’re looking forward to sharing what the teams have been working on for that event.Yeah, so just about sequel, Diablo and Overwatch teams, they are deeply committed to creating awesome AAA experiences for players. So, net-net, for me, it’s — one, it’s a great time to be a Crash fan and two, it’s also really great to see the Company working so well together on so many fronts. And firstly, I’d say we’re really just not done with Call of Duty.
Let me try to attack them one by one. All of this gives us a lot of momentum heading into the second half of this year when we have a lot of things planned. Thank you for the question.
Can you talk about this strategy a little bit and how King resources will be used going forward, especially as it pertains to the Activision Blizzard catalog?Thanks for the question. And finally the Diablo franchise’s entry into mobile Diablo Immortal looks great with Blizzard planning to expand internal testing with the company play test to start in the coming weeks.Now turning to King. And then finally, I think on your last question was in regards to next-gen pricing. We’re seeing really strong momentum with the title of the games now surpassed over 250 million downloads globally and it just keeps on tracking for us.Over the past several months, the team has made really great progress on adding great new content to the community. And of course we are super thankful to our incredible community for their continued trust and support to what we do on Call of Duty. Operator, can we have the next question please.The next question comes from Mario Lu with Barclays. And I’d say we’re just very committed to growing our mobile business. And together, these games have proven accretive to our overall results and it certainly grown our audience on a global basis. These include the impact of the COVID-19 pandemic, the risk factors discussed in our SEC filings, including our 2019 Annual Report on Form 10-K, our first quarter 2020 10-Q and our second quarter 2020 10-Q which will be filed shortly and those on the slide that is showing. Warzone has now brought in more than 75 million players. For 2020, on a non-GAAP basis, we expect product costs, game operations and distribution expenses of 19% and operating expenses, including software amortization of 42%. And while we believe them to be true, they ultimately may prove to be incorrect.
We have seen some engagement and tailwinds moderating somewhat as regions reopen, particularly in some of our games that have less social connective tissue. How should we think about the marketing campaign you've got prepared for this year's Call of Duty? Of course, in these uncertain and unpredictable times, our results are subject to change and volatility.In the second quarter, our player base grew 30% year over year, adding more than 100 million monthly active players. The Ascent is The Motley Fool's new personal finance brand devoted to helping you live a richer life.