Acompli

» see acompli.com as it lived, on the wayback machine

~ the obit ~

Acompli launched on the iPhone App Store on April 25, 2014. The team was Javier Soltero, J.J. Zhuang, and Kevin Henrikson, three engineers with backgrounds at VMware and at a couple of earlier email startups. The pitch was that mobile email was bad, exchange-server connections on phones were worse, and a startup that took the calendar and the contact list seriously as first-class mobile citizens could do better than the iPhone's built-in Mail.app. The product was good. The Android version shipped in September 2014.

On December 1, 2014, Microsoft announced it was acquiring Acompli for a figure widely reported as more than $200 million. Microsoft was at the time roughly one year into Satya Nadella's tenure and visibly buying its way into a phone strategy it could not build in-house. Acompli was a small team, 21 employees, an iOS and Android app, and a strong opinion about how mobile email should work on top of Exchange.

On January 29, 2015, Microsoft rebranded Acompli as Outlook for iOS and Android, with the same app and largely the same code, now under the Outlook brand. The Acompli brand was retired the day of the rename. Javier Soltero stayed at Microsoft for several years to run the Outlook organization, then later moved to Google. Kevin Henrikson stayed at Microsoft. The code became Microsoft's mobile mail strategy for the next decade and is what you are still using when you install Outlook on your phone in 2026.

~ the rap sheet ~

~ how it landed ~

i missed Acompli. for the nine months between april 2014 and january 2015 when it had its own name, i was running iPhone Mail.app against my gmail and not interested in adding a new email client to my home screen. the first time i installed Outlook for iOS, in 2015, i did not know it had been Acompli a month earlier. i installed it because microsoft had finally shipped a mobile mail client that handled exchange properly, and i had a work account on exchange that the built-in Mail.app kept fighting with.

this is the strange property of a successful acquihire. the product wins and the brand dies the same day. people who never heard the original name still use the work that the original team did. i have used Outlook for iOS for ten years and only learned the Acompli pre-history later, doing research for sites like this one.

~ what it actually was ~

Acompli's strong opinion was that mobile email and mobile calendar should share a single timeline, with messages and meetings collapsed into one chronological feed. it treated the email inbox as a stream of objects with deadlines and not as a list of letters waiting to be read. it had a sweep gesture for archiving, swipe-to-schedule, and a focused inbox that filtered low-priority mail to a second tab. these are now standard mobile-email features. they were not, in early 2014.

the actual technical achievement that microsoft was paying for was the exchange integration. acompli had reverse-engineered the exchange ActiveSync protocol well enough to give iPhone users an exchange experience smoother than what microsoft itself was shipping at the time. paying two hundred million for that was, by 2014 mobile email standards, reasonable.

~ what replaced it ~

the Outlook Mobile app you have on your phone in 2026 is still, in its skeleton, Acompli. the design language, the gesture set, the focused inbox, the integrated calendar pane on the right of the message list, all of those came in with the acquisition and stayed. microsoft has rebuilt parts of the renderer and added copilot summarization since, but the bones are nine-month-old startup code from a company that never had time to grow up before microsoft bought it.

this is the pattern microsoft has used several times since. find a small mobile team with a strong opinion, pay above the obvious market price, rename the product, keep the team. it worked for Acompli. it worked for Sunrise. it worked for Wunderlist. the pattern only fails when microsoft buys then ignores, which happens often enough that Acompli is rare for actually becoming the strategy.

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