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  1. Troubleshoot ActiveSync with Exchange Server - Exchange

  2. Troubleshooting ActiveSync Health Set | Microsoft Learn

  3. People also ask
    This feature was designed to help IT organizations control which of the growing number of Exchange ActiveSync-enabled devices are allowed to connect to their Exchange Servers. With this feature, organizations can choose which devices (or families of devices) can connect using Exchange ActiveSync (and conversely, which are blocked or quarantined).
    ActiveSync allows a mobile device to be synchronized with either a desktop PC or a server running a compatible software product. On desktops, ActiveSync synchronizes emails, calendar, contacts and tasks with Microsoft Outlook, along with Internet bookmarks and files. ActiveSync does not support all features of Outlook.
    en.wikipedia.org
    You can use policies you set up in Office 365 to manage any device that uses Exchange ActiveSync to synchronize with your organization’s email, calendar, contacts, and tasks. Exchange ActiveSync is offered on many mobile devices such as Windows Phone, Windows 8 tablets, Android, BlackBerry®, and iOS devices (iPhone and iPad).
    Most Exchange ActiveSync devices request the email address and password to set up the device. This combination only works when the user principal name value matches the email address for the user. Verify these two attributes have the same value. To do this, follow these steps: Open the Exchange Management Shell.
  4. Download ActiveSync 4.5 from Official Microsoft Download Center