New, free Microsoft Outlook Web App clients for iPhone and iPad are available in the Apple App Store, but require an Office 365 subscription for use.

IT controls aside, Outlook for Android and iOS now has IMAP support. Outlook uses IMAP IDLE whenever possible, meaning push-like behavior is possible even with IMAP accounts (if it’s not ...

Microsoft has added support for the iPhone X with its latest update to Outlook on iOS, eliminating the ugly app borders that previously plagued the app on Apple's latest device.