Installed 8.1.3 and cannot see my mail inbox. I have re-booted twice and no inbox.y

Hi Go to Settings Mail check Your Email Addresses Delete them then add them back. Cheers Brian

I tried your solution to no avail. I do receive mail on my iPhone 5 updated to 8.1.3 as well, but no longer on my iPad. When I remove my mail account it actually doubles the other accounts (calendar, etc) after restart the settings are normal again and I added the mail account. It says that everything works fine, but I'd doesn't receive, but it does send mails...

I just wrote this up on another thread. see if this helps you and matches your environment

[SOLVED] iOS 8.1.2 and 8.1.3 Microsoft Exchange mail sync issues