Fix Outlook 2013, 2010 : "Use Cached Exchange Mode" Grayed Out

If you can’t enable Use Cached Exchange Mode option in Microsoft Outlook, follow our guide.
Please consider; This option available for accounts which using Microsoft Exchange. “Use Cached Exchange Mode” option is grayed out if you are only using  POP3 or IMAP Outlook accounts.
This feature also grayed out if you are using Windows Server + Terminal Services installed.
Only Computer administrator can fix this issue.

  1. Press and hold the Windows + R key
  2. Type reg edits into a Search box and clicks OK.
  3. Click the + sign next to HKEY_CURRENT_USER, then go to the following.
    Software, Microsoft, Office, 15.0, Outlook, OST
  4. Right-click NoOST and select Modify.
  5. Provide the value o.
  6. Now restart the Outlook 2013.

Use Exchange Mode” option now not grayed out.
If you can’t perform this solution, contact your system administrator.

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