<0w#25> folder in Microsoft Outlook 2016


For some time already I noticed the presence of this ghost or <0w#25> folder which is annoying. Anyway, fixing it is pretty easy.

<0w#25> Folder


<0w#25> / Empty Folder

About the System

  • Microsoft Windows 10 Pro
  • Microsoft Outlook 2016
  • Gmail Account (IMAP)

Didn’t worked

Few solutions I’ve found on Google.

  • Disabling different addons (such as Kaspersky, Teamviewer, OneNote etc)
  • Running SCANPST.EXE
  • Running Outlook in Safe Mode
  • Different freeware solutions


Renaming .ost file fixed the problem.

  1. Close Outlook
  2. Press WIN + R
  3. Type or Copy/Paste

  4. Make sure File name extensions is checked
    <0w#25> Folder

  5. Rename the .ost file in something else (ex. .ost_)
  6. Open Outlook (it will take longer than usual)
  7. Repeat the above if you have multiple accounts