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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Outlook calendars and contacts sync when they belong to an Exchange or Outlook.com account; adding an email address as IMAP or POP usually syncs only email. If an item is missing, first check which account actually stores it, then check Outlook’s calendar and contacts permissions and sync settings on the device.
What syncs depends on the account that holds the data
Outlook is the app you use to access an account; it does not make every account’s contacts and calendar sync through Microsoft. Exchange and Outlook.com accounts synchronize their mailbox data with the server and other connected Outlook clients. Microsoft says Outlook.com accounts are hosted on Exchange. Its account-type guidance lists IMAP as syncing email, but not contacts or calendar. Microsoft’s Outlook account sync guidance explains the distinction.
| Account or situation | What to expect | What to check |
|---|---|---|
| Exchange or Outlook.com mailbox | Mailbox contacts and calendar sync with the server and connected Outlook clients. | Make sure you are viewing the right account. |
| IMAP or POP account | Microsoft’s sync table lists email, not calendar or contacts. | Use Exchange setup only if the provider supports it; otherwise use the provider’s own calendar or contact connection. |
| Outlook mobile and the phone’s default calendar | Supported Outlook calendars can be exported to the device calendar; Android supports two-way event sync for specified mailbox types. | Enable calendar sync and allow required device permissions. |
| Shared Microsoft 365 or Outlook.com calendar | Some supported sharing setups sync instantly; others refresh periodically. | Check the tenant relationship and whether it was added as a shared calendar or an ICS subscription. |
| Imported or connected contacts | Contacts may appear in an Outlook view without syncing across apps and devices. | Check whether the contact is stored in the Microsoft account or is only imported or connected. |
An email address’s domain alone does not establish how it was added to Outlook. Check the account type in the app’s settings, and distinguish the mailbox from other services that may use the same address.
Why a contact can appear in Outlook but not sync
Outlook People can display contacts from different places, including a Microsoft account, a device, Google, iCloud, or Skype contacts synced through Teams. A contact displayed in Outlook is not necessarily stored in the Microsoft account. Microsoft specifically cautions that contacts imported from a connected account are not synced across apps and devices. Microsoft’s Outlook People guidance describes these contact sources.
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Before expecting a contact to appear elsewhere, identify its source. Microsoft account contacts managed in Outlook People can be available in other places where you sign in with that account; an imported copy or a contact held only by the phone or another provider may not follow the same sync path.
Why Outlook’s calendar may differ from the phone calendar
Seeing an Outlook calendar in Outlook mobile does not automatically merge every event stored locally on the phone or in a third-party service. Microsoft’s mobile guidance says device events need to be associated with an account synced to Outlook. For example, an event held in iCloud requires the iCloud account to be added to Outlook if you want Outlook to access that account’s data. Microsoft’s mobile calendar and contacts troubleshooting steps cover account and app checks.
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On Android, Outlook can export supported account calendars to the phone’s default calendar app. In Outlook, open Settings > Calendar and turn on Sync calendars. Microsoft documents two-way event sync for Microsoft 365, Outlook.com, and hybrid modern-authentication on-premises mailboxes. This setting is for calendar export; it does not turn an IMAP mailbox into an Exchange account. Microsoft’s calendar sync instructions list the supported mailbox types.
How shared-calendar updates differ
A shared calendar does not necessarily update on the same schedule as your own mailbox calendar. Microsoft says instant sync is available for Microsoft 365 users in the same tenant and for Outlook.com shared calendars in the configurations it lists. For different-tenant Microsoft 365 sharing, Microsoft describes updates approximately every three hours. For ICS subscriptions, the recipient service controls refresh timing; Microsoft gives examples of approximately three hours for Outlook.com and 24–48 hours for Gmail. These are service examples, not guaranteed intervals for every shared calendar. Microsoft’s shared-calendar sync guidance explains the timing differences.
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If a shared calendar seems stale, check how it was shared and added. A calendar added as a shared calendar may behave differently from an ICS subscription, and the owner’s account and tenant relationship matter.
Troubleshoot missing calendar or contact data
- Identify the account type. Determine whether the mailbox is Outlook.com, Microsoft 365/Exchange, or an account configured as IMAP or POP. If the phone lists IMAP and offers no calendar option, Microsoft advises re-adding the account through Exchange only if the provider supports Exchange setup.
- Check where the item was created. Confirm the event or contact belongs to the account you expect to sync. A local phone calendar, iCloud account, or imported address-book entry may be separate from the Outlook mailbox.
- Check Outlook’s account settings and phone permissions. In Outlook mobile, confirm Calendar is selected for the account. Allow Contacts access in the phone’s app settings. On iPhone, Microsoft’s troubleshooting steps also include Outlook’s Contacts permission and Background App Refresh; on Android, check Outlook’s Contacts permission.
- For Android’s default calendar, enable calendar export if needed. In Outlook, go to Settings > Calendar and enable Sync calendars. Two-way sync is documented for Microsoft 365, Outlook.com, and hybrid modern-authentication on-premises mailboxes.
- Reset or re-add the account if settings are correct. Microsoft’s troubleshooting sequence includes Reset Account in Outlook mobile. If that does not help, remove the account from the device and add it again. An IMAP prompt may indicate the provider’s setup does not support calendar and contact sync through Outlook.
- Ask the organization’s administrator about a work or school account. An organization can control account policies, device management, and supported connection methods. Microsoft directs business Microsoft 365 and Exchange users with account-sync problems to their administrator or technical support.
Work or school accounts and older device connections
For work or school accounts, Microsoft removed the Outlook on the web Mobile devices settings page in late 2025. Microsoft now directs users to the My Account Devices page to view or disable connected devices. Removing a device partnership is not the same as remotely erasing the physical phone; mailbox removal or a wipe is an administrator task. Microsoft’s work or school device guidance explains the current distinction.
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Protocol compatibility can also matter for older devices. Microsoft says devices using ActiveSync versions below 16.1 can no longer connect starting March 1, 2026; that cutoff is in effect as of October 4, 2026. It is one possible cause of a connection problem, not a diagnosis for every calendar or contact sync failure. Microsoft’s mobile sync troubleshooting page includes the compatibility notice.
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