Why is the Mail App not opening?

Why is the Mail App not opening?

If you are not able to open the app on your device, you can access the emails through a web browser: 

To log into your webmail portal, add "mail." to the start of your domain name.
e.g.
https://mail.mappingtonparishcouncil.gov.uk

or go to:

To get the app back up and running here are a few suggestions:
1. if you have a second screen set up but not turned on, it may be displaying on that screen, either turn on the second screen or skip to step 2.
2. check whether Zoho Mail is already running by opening Task Manager.  If it is then close it and reopen.
3. restart windows to clear any background processes.
4. Uninstall the app and reinstall the latest version