Microsoft acquired Sunrise, a maker of calendar apps for Apple's iOS and Google's Android mobile operating systems.

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Microsoft is adding another mobile productivity app to its quiver.

The company says it has acquired Sunrise, a maker of calendar apps for Apple’s iOS and Google’s Android mobile operating systems. The deal comes two months after the purchase of Acompli, a popular builder of email apps that Microsoft later used as the base for new Outlook email apps for those operating systems.

Microsoft, whose Windows platform accounts for a tiny share of the global tablet and smartphone markets, has been trying reaching customers on competing platforms. In November, the company unveiled free versions of some of its Office productivity suite for iOS and Android, and has since completed the Acompli and Sunrise deals to bolster its ability to build products for those platforms.

Rajesh Jha, a vice president with Microsoft’s Outlook and Office group, said in a blog post that the company planned to keep Sunrise free of charge and available to download. Jha didn’t disclose the terms of the purchase.

Microsoft has had a bit of trouble keeping these deals under wraps.

TechCrunch reported last week that Microsoft would spend more than $100 million to buy Sunrise. A bit before Microsoft officially confirmed the deal on Wednesday, Microsoft apparently posted (and quickly made private) a YouTube video announcing the agreement.

The week before announcing the purchase of Acompli, Microsoft published (and quickly unpublished) a blank shell of a blog post evidently meant to announce that deal.