Outlook 2016 Attachment Button not Working (Disappears)

Issue:

If you open a “New Email” and click on the attachment paperclip button the drop down disappears before you can use it.  If you notice the new email window flashes like a loss of focus and the focus comes back repeatedly.

Solution:

  1. Close Outlook.
  2. Close and save all Word & Excel files.
  3. Restart your computer
  4. Open a blank document in Word.
  5. Go to, File – Account.
  6. Select, Sign out.  or
  7. Now select, Sign in. (complete the on screen instructions for signing in)
  8. Open blank document
  9. In Word click on File -> Open on the left bar then “Sites” SharePoint Site and double click on a folder to verify it is connected
  10. Click on OneDrive and make sure you are logged in.
  11. If you are using OneDrive for Business sync make sure it is logged in (No exclamation mark in the system tray OneDrive icon).
    Note: If asked, select either your Work account or Microsoft account as appropriate.

 

Resources:

https://social.technet.microsoft.com/Forums/ie/en-US/c491b3d1-d912-4b6c-a462-2b920528d8e2/unable-to-attach-file-to-new-message-in-outlook-2016?forum=outlook

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