Sorry but what you are seeing is absolutely true and how things work in today's email applications.
You'll have to change your email applications (also called an email client) to fix this. Also you can use a web browser to look at your email and that will look the same all over.
Nothing new going on here, write back if you want a little bit more how we got here.
Comcast Email is used.
Using Android phone and Windows Live Mail on PC.
Made sure delete from server when deleted is checked on both devices.
After I delete and Email on a device, it deletes in the Comcast Webmail, but not on the devices it has already downloaded on.
It there a way to reflect these changes, to have a 100% Inbox Sync on all devices?