If your email folders are missing after updating your email client, there are a few steps to take to try to get them back:

1. Check the server settings for your email account.
2. Ensure that the email client is configured correctly for the type of email account you have.
3. Check to see if the folders are available if you sign in to the web-based version of your email account.
4. Restore the files from a backup, if available.
5. Contact your email provider for assistance.