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Reset Exchange ActiveSync (EAS) connections for Exchange, Office 365 and Outlook.com accounts

I’ve been trying to add my Outlook.com to the Mail app for some time now but, when synchronizing, each time I get the error;

Something went wrong
We’re having a problem connecting to eas.outlook.com.
Contact a support person or your service provider.
Error code: 0x86000c09

Is there anything I can reset to make this work again?

Reset EAS AccountThis error usually relates to a broken EAS sync partnership. Troubleshooting the local Mail application isn’t going to bring you anything as it is broken on the mail server.

Luckily, in the case of an Outlook.com, Exchange or Office 365 Exchange Online mailbox, you can reset this EAS sync partnership yourself via Outlook on the Web or Outlook Web Access (OWA).

Note: This does not apply to Outlook.com accounts that have not yet been migrated to the new Outlook.com platform.

EAS sync error 0x86000c09 in the Windows 10 Mail app.
The EAS sync error 0x86000c09 in the Windows 10 Mail app indicates a sync partnership issue which you can reset yourself.

Mobile devices

Outlook Web App (OWA) buttonWithin Outlook on the Web or OWA, there is a special section to see and remove the mobile devices you are synching your mailbox with.

  1. Logon to Outlook on the Web
    • Outlook.com (Outlook Mail)
      https://outlook.com
    • Office 365 Exchange Online
      https://outlook.office.com
    • Exchange on premises
      URL provided by your company which is often also exposed when going to File-> Info in Outlook 2010 and later.
  2. Open the Options page by clicking on the Gear icon in the top right corner (left from your display image) and;
    • Outlook.com (Outlook Mail)
      Choose “Options”.
    • Office 365 Exchange Online
      Choose “Mail” near the bottom of the Settings panel that opens.
    • Exchange on premises
      Choose “Options”.
  3. In the Options screen choose: General-> Mobile Devices.
    • For Exchange 2010 and Exchange 2013 select “Phone” instead.
  4. You’ll now see an overview of devices that you sync your mailbox with. Click on the pencil icon to help you find the sync partnership of the device you are having issues synching with.
  5. Once you’ve found the troublesome sync partnership, click on the remove icon to delete the sync partnership.
  6. Confirm that you want to remove it.

After removing the sync partnership in OWA, your Mail app should be able to sync now.

Outlook on the Web gives you an overview of your configured mobile devices and allows you to remove any old or troublesome sync partnerships. (click on image to enlarge)
Outlook on the Web gives you an overview of your configured mobile devices and allows you to remove any old or troublesome sync partnerships. (click on image to enlarge)


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