Outlook add-in is not the newest version
If the Outlook add-in has not refreshed within 24 hours of an update being available, it could be cached locally by the Outlook client. The following steps can be followed to clear the cache and force Outlook to download the latest version.
On the PC running Outlook O365 edition:
- Close Outlook
- Open File Explorer, or use Windows-R to open the Run dialog, and enter
- Move all of the files and folders to a temporary folder, thus deleting them all from the
- Restart Outlook