How to Add an Outlook / Microsoft 365 Calendar to iPhone & iCloud

You want your work calendar from Outlook to show up on your iPhone alongside everything else — read-only, always current. Apple Calendar can subscribe to ICS feeds, but Microsoft's published feed often imports at the wrong time or not at all.

Why Outlook feeds break on Apple devices

Apple Calendar is strict about the ICS format. Microsoft's feeds use Windows time-zone identifiers and skip parts of the standard that Apple relies on, so events show at the wrong hour or the subscription silently fails.

The fix

Convert the feed first, then subscribe to the clean version. CalConverter normalizes the feed (proper IANA time zones and VTIMEZONE) so Apple Calendar reads it correctly.

On iPhone or iPad

1. Publish your Outlook calendar (Outlook on the web → Settings → Calendar → Shared calendars) and copy the .ics link.
2. Convert it with CalConverter and copy the result.
3. On your device: Settings → Calendar → Accounts → Add Account → Other → Add Subscribed Calendar, paste the converted URL, and save.

On Mac

In Apple Calendar: File → New Calendar Subscription, paste the converted URL, then choose how often it should refresh (e.g. every hour).

Once subscribed, your Apple devices pull updates on their own and your Outlook events stay current everywhere.