Another popular app got an update today. Calendars by Readdle (and also Calendars 5) now lets you add Microsoft Outlook accounts. Support for multiple accounts was also added. This means you can now have Google, iCloud, and Outlook (Exchange) accounts in the app simultaneously. This is in the Pro version of Calendars 5, which is on sale for 40% off (usually US$3.99). Other features include: Drag and drop events; Manage events both online and offline, Special keyboards; Search, and more. App Store: Free (Offers In-App Purchases)
Check It Out: Calendars by Readdle Now Lets You Add Outlook Accounts