Microsoft (MSFT) announced yesterday via Twitter that Office for iPad, which launched March 27, has been downloaded more than 12 million times from the iTunes App Store. Office for iPad includes Excel, OneNote, PowerPoint and Word, and the apps are free to download and use to read Office documents. However, creating or editing documents in Excel, PowerPoint or Word requires users to purchase an Office 365 subscription.

Office 365 subscribers can add an iPad as one of their chosen devices included in their subscription benefits. Office for iPad provides cloud storage from OneDrive or OneDrive for Business and allows managed service providers (MSPs) to access their OneDrive files at any time.

"Microsoft is focused on delivering the cloud for everyone, on every device," Microsoft CEO Satya Nadella said in a press release, announcing Office for iPad. "It's a unique approach that centers on people - enabling the devices you love [to] work with the services you love, and in a way that works for IT and developers."

Office 365 is Microsoft's fastest-growing commercial product ever. But as of today, Microsoft has not commented on how many Office 365 subscriptions it has sold via Office for iPad in-app purchases or to all Office for iPad users.

"We're extremely pleased with the Office for iPad interest we've seen from consumers and business[es] alike. We have no additional details to share," the company told The Seattle Times.

Microsoft Vice President Jeff Teper discussed Office 365 and its potential during his keynote speech at last month's SharePoint Conference in Las Vegas. According to Teper, Microsoft is prioritizing the cloud for Office 365 in the hopes of providing faster, more relevant information.

"Today, the world has become a giant network where connections make information more relevant and people more productive. Most companies, however, are not working like a network, which we believe is vital for their ability to improve collaboration and respond to customers, competition and market changes," Teper said in a press release. "The new Office 365 experiences powered by cloud, social, mobile and big data technologies enable people and teams to find the right connections and most relevant insights to get more done."