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The sync is one-way, from Outlook to the native Contacts app, so your contacts should be edited within Outlook (desktop, OWA or the Outlook app). In iOS, any changes made in the Contacts App will not be available in the Outlook for Mobile App. This is an ongoing synchronization, so any items added or updated in Outlook will be synced to your mobile device within a few minutes. This will only sync your personal contacts, not the contents of the Global Address List (GAL).
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In order to have your personal Outlook contacts available for use across other apps on your phone, follow the instructions below to sync contacts from your Outlook for Mobile app into your default Contacts app. How to Save Outlook Personal Contacts to the Default Contacts App on a Mobile Device
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