Can't sync emails or create account in Mail for Windows 10 after upgrade from build 16299.0

Last Updated: October 19, 2017

ISSUE

After upgrading from Build 16299.0 to 16299.15, you may experience problems with Mail for Windows 10, including the following:

• Your email accounts stop syncing new emails.

• You can't view email settings.

• You can't create new email accounts.

This occurs because one of the main components for email functionality is a Function-on-Demand (FOD) package that may have been removed.

STATUS: WORKAROUND

To workaround this issue, you will have to manually reinstall your missing FOD package via command prompt using these steps:

1. At Start, type command prompt. The best match will be Command Prompt - Desktop app, right click this result and choose Run as administrator.

2. Select Yes to allow the app to make changes to your device.

3. At the command prompt, enter the following:

   dism /online /Add-Capability /CapabilityName:OneCoreUAP.OneSync~~~~0.0.1.0

4. Press Enter. The reinstall will start. If you aren't seeing progress, you can press Enter again.

5. Once the reinstall is complete, you will be prompted to restart your device. If you're not prompted, restart the device yourself.

6. After restarting, confirm your account is syncing correctly in the Mail app. If the account does not appear to be syncing correctly, try the following:

   • In the Mail app, go to Settings > Manage Accounts and select an account to edit settings. If the Account settings dialog is available, the component was successfully installed.

   • If the account is still not syncing, delete and re-add the account again in the Mail app. To do this: Click Settings > Manage Accounts and select the account. Click Delete account from this device and click Delete. Once the account is removed, select Add account to re-add it.