Problems updating windows phone
You'll need the following information: If you're using an Exchange account that requires advanced settings, you'll need to remove the account and add it again using advanced settings.To add the account using advanced settings, see Add an account using advanced setup.
See Change your password in Mail for Windows 10 for more information.We have a few things you can do to attempt to fix this problem.Select Start, type “wsreset“, then select the “wsreset” option.The most common cause of an out-of-date account is an incorrect password.In the notification bar at the top of the app, select Fix account.This article will help you to fix the bug in Lumia 535.
When attempting to download apps from the Windows Store, Microsoft Windows 10 users may experience a problem where the app is stuck in a “Pending” state, and the download never completes.
Before you begin, make sure that your device has the latest operating system and app updates.
Try the general troubleshooting solutions in Troubleshooting Mail and Calendar apps for Windows 10.
Although we don't recommend permanently turning off security software, you can go to the software manufacturer's website to see if they have workaround steps, or you can temporarily turn off the software to see if that fixes the issue.
If so, contact the manufacturer's technical support to find a way to access your email without disabling their software.
Check the software documentation to learn how to temporarily turn it off.