Outlook on the web. Mail and Calendar. Available for purchase as part of Office or Microsoft 365. Accessible from most browsers at Microsoft 365 portal. Available for iOS and Android devices. Outlook is our most full-featured email and calendar app, optimized for PCs and laptops. Christina - an android app with a silly name of Task Task is designed to sync both task and notes with a Outlook using MS ActiveSync. It works real well. As Kelly mentioned you can move everything to ToDo but on Windows you have to have Windows 10 for ToDo to work. Task Task is an older app that has been around for a long time - very reliable.

Sync Outlook For Mac And Outlook Android App Windows 10
Outlook Android Sync App
Sync Outlook With Android Phone
Sync Outlook For Mac And Outlook Android Apps

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Summary: This article covers the most common questions asked by customers and administrators about using Outlook for iOS and Android with Exchange Online and Microsoft 365 or Office 365.

The Outlook for iOS and Android app is designed to enable users in your organization to do more from their mobile devices, by bringing together email, calendar, contacts, and other files. The following sections highlight the most common questions we receive, across three key areas:

Outlook for iOS and Android architecture and security
Managing and maintaining Outlook for iOS and Android in your Exchange organization after it has been deployed
Common questions from end-users who access information in your Exchange organization with the Outlook for iOS and Android app on their mobile devices

Architecture and security

Sync Outlook For Mac And Outlook Android App Windows 10

The following questions are about the overall architecture of Outlook for iOS and Android in Exchange Online, as well as user authentication and other security concerns.

Q: What cloud architecture is utilized by Outlook for iOS and Android for Microsoft 365 or Office 365 accounts?

For more information on the architecture, see Outlook for iOS and Android in Exchange Online.

Q: Can I add two different Microsoft 365 or Office 365 accounts from different regions to Outlook for iOS and Android?

Yes, provided both accounts do not have Intune App Protection Policies assigned. However, for Government Community Cloud customers, users may only add their own account and OneDrive for Business storage account to the app; adding personal or other commercial accounts is prevented to meet FedRAMP requirements. For more information on Government Community Cloud restrictions with Outlook for iOS and Android, please see Using Outlook for iOS and Android in the Government Community Cloud.

Q: What authentication mechanism is used for Outlook for iOS are Android? Are credentials stored in Microsoft 365 or Office 365?

See Account setup with modern authentication in Exchange Online.

Q: Do Outlook for iOS and Android and other Microsoft Office mobile apps support single sign-on?

See Account setup with modern authentication in Exchange Online.

Q: What is the lifetime of the tokens generated and used by the Active Directory Authentication Library (ADAL) in Outlook for iOS and Android?

See Account setup with modern authentication in Exchange Online.

Q: What happens to the access token when a user's password is changed?

See Account setup with modern authentication in Exchange Online.

Q: Does Outlook for iOS and Android support certificate-based authentication?

Yes, Outlook for iOS and Android supports certificate-based authentication for modern authentication-enabled accounts (Microsoft 365 or Office 365 accounts or on-premises accounts leveraging hybrid modern authentication). For more information, see:

Q: What does background synchronization enable? I notice that when I launch the app with it enabled, I still have to wait for messages to download, even after I've received new mail notifications for them; and sometimes, I get reminders for appointments that had been canceled.

Background synchronization enables new message notifications, calendar reminders, badge count updates, and background synchronization of mailbox and calendar information for Outlook for iOS and Android.

If background synchronization is disabled by the user in the mobile operating system's settings, then the user must launch the app and keep it in the foreground in order to synchronize messages and have an up-to-date calendar.

Background synchronization in Outlook for iOS and Android can also be temporarily disabled by the following actions:

Force quitting Outlook for iOS.
Restarting the iOS device.
Outlook for iOS crashes and is not restarted by the user.
Not opening the app for a given period of time. iOS will automatically freeze third-party apps, like Outlook, based on usage patterns. Android doze mode and app standby features can also prevent background updates to the app while those features are active.
On some Android devices, you can also restrict background processing or network access per-app. In these cases, Outlook for Android will not be able to process updates in the background. Android device manufacturers can modify the way you can interact with settings, therefore it is not possible to document every device scenario, but in general, these are the steps you can take to remove battery optimization:
1. Open Settings.
2. Tap Battery.
3. Tap the ellipse and tap Battery optimization.
4. Tap the down arrow and tap All apps.
5. For the Microsoft Authenticator, Intune Company Portal and Outlook apps, tap Not optimized to turn off battery optimization.

If the mobile operating system prevents background synchronization, users will experience the following:

New mail notifications will continue to be delivered, however, upon launching the app, the new messages will have to be downloaded.
Calendar reminders will fire for appointments that have been canceled because the app was unable to download and process the meeting cancellation.

Note

Apple allows its native Mail and Calendar apps to do background refreshes without any restrictions. Therefore, users may notice a difference in the background synchronization experience between the apps. However, this also results in improved battery life and less data consumption with Outlook for iOS.

Q: Does each user's instance of Outlook for iOS and Android have a unique device ID in the Microsoft 365- or Office 365-based architecture? How is the device ID generated and is this same device ID used in Intune?

Upon initial account login, Outlook for iOS and Android establishes a connection to the Microsoft 365- or Office 365-based architecture. A unique device ID is generated, and this device ID is what appears in Active Directory device records (which can be retrieved with cmdlets such as Get-MobileDevice in Exchange Online Powershell) and which appears in HTTP request headers.

Intune uses a different device ID. The basic workflow for how Intune assigns a device ID is described in App-based conditional access with Intune. In Intune, the device ID is assigned when the device workplace joins for all device-conditional access scenarios. This is an AAD-generated unique ID for the device. Intune uses that unique ID when sending compliance information, and ADAL uses that unique ID when authenticating to services.

Q: Does Outlook for iOS and Android support RMS?

Yes. Outlook for iOS and Android supports reading protected messages. Outlook for iOS and Android works differently than desktop versions of Outlook when it comes to RMS. For desktop versions of Outlook, once a protected message is received and access is attempted, and Outlook verifies that the user can read RM messages, Outlook connects to Exchange to request an encryption key. The Outlook desktop client uses that encryption key to decrypt the message in front of the user (client-side). Mobile clients operate differently. When Outlook for iOS and Android sets up its initial relationship with Exchange, it notifies Exchange that it supports RMS. Exchange decrypts any protected messages before passing th