The fastest way: use the built-in Mail app
Your iPhone can read Outlook calendars directly through the Mail app that comes with every iPhone. You do not need to read anything extra. Open Settings, tap Mail, then Accounts, then Add Account. Choose Outlook, enter your email address and password, and toggle Calendar on. Your Outlook events will appear in the iPhone Calendar app within a few minutes.
This method works whether you use Outlook.com, Microsoft 365 (formerly Office 365), or an Outlook account through your employer. The calendar syncs automatically — when you add an event in Outlook on your computer, it shows up on your iPhone, and vice versa.
If you already have an Outlook account set up in Mail but the calendar is not showing, go back to Settings > Mail > Accounts, tap your Outlook account, and make sure the Calendar toggle is switched on.
Key Takeaways
- Add your Outlook account through Settings > Mail > Accounts > Add Account, choose Outlook, and toggle Calendar on — no separate app needed.
- Your calendar syncs both ways: changes on iPhone appear in Outlook, and changes in Outlook appear on iPhone within minutes.
- If you use Microsoft 365 or an employer Outlook account, the same process works; the account type does not matter.
- The Outlook app itself can also display your calendar if you prefer a dedicated Microsoft interface, but the Mail app method is simpler for most people.
Why the Mail app is usually the better choice
The Mail app method keeps your calendar in the iPhone Calendar app, which is where you probably already look for events. You see Outlook events alongside any other calendars you use — Google Calendar, iCloud, work calendars from other systems. Everything lives in one place.
The Outlook mobile app exists and does show your calendar, but it is a separate app you have to open. Most people find it easier to stick with Calendar and let Mail handle the syncing in the background. The Mail app method also uses less phone storage and battery because you are not running a second calendar process.
Using the Outlook app if you prefer it
If you want to use the Outlook mobile app instead, read it from the App Store, open it, and sign in with your Outlook email and password. Your calendar will load automatically. You can then open the app whenever you want to see your schedule.
The Outlook app is useful if you also use Outlook email heavily on your phone and want everything in one place. It also has some features the Calendar app does not — like the ability to see other people's availability when you are scheduling a meeting. But for most people who just want their Outlook events on their phone, the Mail app method is simpler.
Fixing sync problems
If your Outlook calendar is not showing up after you add the account, first check that the Calendar toggle is actually on in Settings > Mail > Accounts. Tap your Outlook account and look for the Calendar switch.
If the toggle is on but events still are not appearing, try signing out and back in. Go to Settings > Mail > Accounts, tap your Outlook account, tap Delete Account, then add it again. This forces your iPhone to re-sync everything from Outlook's servers.
If you have a very old iPhone running iOS 14 or earlier, Outlook calendar syncing can be slower or unreliable. Updating to the latest iOS version usually fixes this. Go to Settings > General > Software Update to check.
Sharing your Outlook calendar with others
If you want to let someone else see your Outlook calendar, you do not do it from your iPhone — you set it up in Outlook on your computer first. Open Outlook, right-click your calendar name, choose Share, and enter the person's email address. Choose whether they can view only or edit events.
Once you have shared the calendar in Outlook, the other person can add it to their iPhone the same way you added yours. They go to Settings > Mail > Accounts > Add Account, sign in with their own Outlook account, and the shared calendar will appear in their Calendar app.
What happens when you delete the Outlook account
If you remove your Outlook account from your iPhone, the calendar events disappear from the Calendar app. They are not deleted from Outlook itself — they just stop syncing to your phone. If you add the account back later, the events reappear.
Be careful not to delete events directly from the Calendar app if you want to keep them in Outlook. Deleting an event from Calendar also deletes it from Outlook because they are synced. If you only want to hide an Outlook calendar from your iPhone without deleting the events, go to Calendar > Calendars and uncheck the Outlook calendar name instead.
Frequently Asked Questions
Do I need a Microsoft 365 subscription to sync Outlook to iPhone?
No. A free Outlook.com account works just as well as a paid Microsoft 365 account. The syncing process is identical. If your Outlook account is through your employer, that works too — your IT department has already set up the account to sync with phones.
Can I add multiple Outlook accounts to the same iPhone?
Yes. Go to Settings > Mail > Accounts > Add Account and repeat the process for each Outlook email address. Each calendar will show up separately in the Calendar app, and you can toggle them on or off individually to see only the ones you want.
Will events I create on my iPhone show up in Outlook on my computer?
Yes, as long as you create them in the Outlook calendar, not in a different calendar. When you add a new event in the Calendar app, make sure you tap the calendar name at the bottom and select your Outlook calendar before saving. Changes sync within a few minutes.
What if my Outlook password changes?
Your iPhone will stop syncing until you update the password. Go to Settings > Mail > Accounts, tap your Outlook account, tap Account, and enter your new password. Syncing will resume when ready.
Can I see my Outlook calendar offline on iPhone?
Yes, but only events that have already synced to your phone. Once an event is in the Calendar app, you can view it without an internet connection. New events from Outlook will not appear until you have a connection again.