Microsoft services are ubiquitous across the major mobile OSs, and one of the main reasons is that it doesn't matter which device you choose to put in your pocket. In the case of the iPhone, setting up your calendars can be done in a couple of ways, neither of which are complicated.
Download Outlook for iOS
It's that simple. Now, really, it is. The Outlook app for iOS contains both your email and calendars in one application and is hands-down the easiest way to use either of them on your iPhone.
Microsoft acquired a forms iOS app, called Accompli, which formed the base of the Outlook app. Everything that was good about it lives on, and it's a winner for getting your Microsoft stored important bits on the iPhone.
Not only can you access your Outlook calendars through the iOS app, but you can hook in Just about any email address – Outlook, Exchange, Gmail and more besides can be used with Outlook
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With this set up on the iPhone, you'll be able to just use the stock apps with your Microsoft Account or third-party ones that need to hook into this information to operate.
Which of these two methods you use, you'll be well taken care of.
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