When one upgrades to windows 10 mobile from windows phone 8.1, following features are lost or not supported.
* Notifications for missed calls, messages, and emails on contact tiles is not supported at the time of Windows 10 Mobile release.
* Me Tile and Me Card are no longer supported.
* Cortana can no longer search for apps, setting, email, text messaging, contacts and QR Codes on the device and can no longer open apps through voice commands.
* "Hey Cortana" is no longer available on some upgraded devices.
* Group tiles can no longer be used to receive social networking status updates.
* Indoor Maps are no longer available for some locations.
* Certain enterprise features, including Data Protection Under Lock, are not available; please contact your Microsoft Volume Licensing representative for more information.
* At time of Windows 10 Mobile release Outlook Mail app cannot open .EML attachments.
* Outlook Calendar app does not support Tasks.
* MDM capability to prevent saving and sharing Office documents not supported.
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