Calendars on apple iPhone are playing an important role, and syncing iPhone calendar with outlook can keep the daily events, and schedules for more daily tasks. Often, users can experience an annoying problem that is iPhone calendar not syncing with outlook calendar. No matter, what is minor or major issue, but I don’t have solutions for outlook calendar not syncing with iPhone. This technical problem is a big and hard issue, so I don’t have much experience to sort out this technical issue. Can you recommend the permanent resolutions to fix this technical problem as soon as possible?
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Check your sync settings
Check that Calendar is enabled for your account:
Go to the Calendar in the Outlook app and tap the three lines in the upper left-hand corner.
Under your email accounts, make sure "Calendar" is selected.
If your email address is not displayed in the list, it's not set up using Exchange ActiveSync. You'll have to delete and re-add your account and make sure not to use IMAP.
Check that access to Contacts is allowed for Outlook:
Steps may vary between devices and between operating systems. If you don't own an iOS or Samsung Android device, use these directions as a guideline:
For iOS: Open the Settings app > scroll down and tap Outlook > Contacts and Background App Refresh should be on.
For Android: Open phone Settings > Applications > Outlook > Make sure Contacts is enabled.
Then open the Outlook app and go to Settings > tap on your account > tap Sync Contacts.
Troubleshoot calendar and contacts in the Outlook mobile app
In the Outlook app, go to Settings Outlook app settings > Tap the account that is not syncing > Tap Reset Account. Check to see if your account is syncing.
Still not working? Delete and re-add your email account:
From Settings Outlook app settings, tap the account that is not syncing > tap Delete Account > Delete From This Device.
Then re-add your email account in Outlook for Android or Outlook for iOS.
More info: Exchange 2010 to 2016 Migration | Email Migration Service
Regards, Bruce