Microsoft announced its acquisition of Acompli on December 1, 2014, and the deal quickly became the foundation for a new Outlook experience on iOS and Android. Microsoft was buying more than an email app: it was adding Acompli’s mobile technology and team to accelerate cross-platform productivity, then combining that work with its existing Outlook development.
What Microsoft acquired on December 1, 2014
Microsoft described Acompli as a provider of mobile email applications for iOS and Android. Its announcement highlighted capabilities that were especially relevant to people working from phones and tablets:
- Prioritizing important messages in the inbox
- Scheduling meetings from email
- Working with attachments and files
Rajesh Jha, Microsoft’s executive vice president for the Office Product Group, said the acquisition was part of “our company-wide effort to help people accomplish more with their mobile devices.” Microsoft also said it wanted to support the variety of email services people used, rather than limit mobile productivity to one account type.
The company’s announcement said it would build on Acompli’s application and bring that work together with development already under way on Outlook. That wording makes the transaction both a product acquisition and a team acquisition: Acompli supplied a functioning mobile experience, while its people and technology could shorten Microsoft’s path to a stronger mobile Outlook.
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Why Acompli fit Microsoft’s mobile strategy
Microsoft was pursuing a cross-platform approach to productivity. Acompli already operated on Apple and Android devices, giving Microsoft a mobile email product outside the Windows ecosystem and an experienced team focused on phone-based workflows.
The strategic interpretation supported by Microsoft’s statements is acceleration. Buying an established app and its talent could move Microsoft toward a polished mobile email experience faster than building every component internally. The evidence does not establish a specific competitive motive beyond that broader productivity objective.
Microsoft’s 2014 announcement included the statement that “more than half of email messages are first read on a mobile device.” That was a figure Microsoft cited at the time, not an independently verified current measurement, so it should be read as period context rather than a present-day market statistic.
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The short path from Acompli to Outlook mobile
| Date | Event | What it shows |
|---|---|---|
| December 1, 2014 | Microsoft announces the Acompli acquisition. | Microsoft connects the deal to cross-platform mobile productivity and says Acompli will be combined with Outlook work already in progress. |
| January 29, 2015 | Microsoft launches Outlook for iOS and Android. | The launch is based on the acquired Acompli application and technology; the Acompli team joins Outlook. |
| February 11, 2015 | Microsoft announces its separate acquisition of Sunrise. | Microsoft places Acompli and Sunrise in a wider effort covering mobile email and calendaring across platforms. |
| May 3, 2015 | A Microsoft Ignite session discusses Outlook on mobile devices. | The session description links Acompli’s acquisition to the expansion of Microsoft’s mobile email roadmap. |
January 2015: Outlook becomes the visible result
On January 29, 2015, Microsoft launched Outlook for iOS and Android based on the Acompli application and technology. TechCrunch reported that the Acompli team had become a core part of the Outlook team. This is the clearest concrete outcome of the acquisition: within roughly two months, the acquired product had been turned into the basis of a Microsoft-branded mobile Outlook release.
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What the first Outlook mobile release supported
The January 2015 launch coverage described support for Office 365, Exchange, Outlook.com, Yahoo! Mail, Gmail and most other email providers. Those were launch-era claims, not a current compatibility list. Microsoft’s stated goal was to make Outlook useful across the mixture of services people already used.
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That provider breadth mattered strategically. A mobile client that handled only Microsoft-hosted mail would have limited reach; an app designed for multiple services could serve existing Outlook users while also attracting people whose primary accounts were hosted elsewhere.
How Sunrise extended the same direction
Microsoft announced the acquisition of Sunrise, a mobile calendar app, on February 11, 2015. In that announcement, Microsoft grouped the recent Acompli acquisition with its ambition to rethink productivity, mobile email and calendaring across platforms.
Sunrise was not another email acquisition or a direct alternative to Acompli. Its relevance is organizational: email and calendar were being treated as connected mobile productivity problems. Acompli addressed the inbox and message workflow; Sunrise addressed scheduling and calendar coordination.
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What is known—and not known—about the deal
Acquisition date
Microsoft’s official announcement and its acquisition-history record identify December 1, 2014, as the acquisition date.
Purchase price
TechCrunch reported a price of $200 million in its January 2015 launch coverage. Microsoft’s official announcement and the acquisition-history record do not verify that figure, so it should be treated as a contemporaneous report rather than a disclosed official term.
Current standalone Acompli availability
The documented sequence ends with the 2015 Outlook launch and later mobile-roadmap references. These sources do not establish whether Acompli remains available today as a separate application. They do establish that its application and technology became the basis for Outlook on iOS and Android.
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How much of Acompli survived
The record supports a product lineage and a team integration, not a feature-by-feature preservation claim. Microsoft combined Acompli’s work with Outlook development; the available sources do not say that every screen, feature or implementation was carried over.
Why the acquisition mattered
Acompli gave Microsoft a credible starting point for mobile email on two major platforms and a team already focused on inbox management, attachments and scheduling. Microsoft then used that foundation for a rapid Outlook launch, preserving the Outlook brand while expanding its reach beyond Microsoft’s own operating-system history.
In practical terms, the acquisition changed the question from “How will Microsoft build a mobile email client?” to “How quickly can Microsoft turn an acquired mobile client into Outlook?” The January 2015 release supplied the answer: very quickly, with Acompli’s technology and people at the center of the effort.
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