Have you tried rolling back to the previous build and then installing the latest build? Not sure it will work but maybe worth a try.

Build 16241 also fixed my problem with Comcast Email an all four of my computers.

I tried deleting the account and reinstalling it. I know the password that I used is the correct one because it works with other email apps. I also experimented with changing smtp and imap numbers...

I have four computers with Windows 10 fast ring. On the three that were updated to Build 16237 Comcast email no longer works. Comcast email still works on the computer with build 16232. That leads me...

The password works with Comcast Xfinity email, and it works with Windows live mail. Windows 10 insider build 16237 does not allow me to change the password to the correct one for Comcast mail. I...

After installing insider build 16237 Comcast mail no longer works. Inserts wrong password (too many characters) and password cannot be changed.

I am having the same problem with 2 computers.

The problem was solved by removing Stardock addon software that restored windows 7 start button to windows 8.

After about 20 upgrade attempts, the new build (rtm?) was upgraded. I did nothing but keep trying to get the upgrade many times, when much to my surprise the upgrade finally succeeded. I can't take...

I have only one issue after four upgrades of windows 10 on four different computers. On one of my computers the windows logo start button is missing. It is probably an easy fix but I have not found...

Yogi Berra is one of my all time favorite players. He hit home runs off balls that were thrown at his ear.

Persistence paid off. After an insane amount of attempts the upgrade was successfully completed. I did nothing but keep running the upgrade and to my great surprise the last attempt succeeded. I...

Yoga Berra wouldn't think so.

The upgrade finally finished successfully after an insane number of attempts.

During the upgrade there is an indication that it is operating in safe mode. It appears twice during the process in all four corners of the screen. I may have to wait until the 29th or later.

I have tried several times to upgrade from Build 10166 to 10240 and this last attempt got to install files 80 percent before a restart occurred and windows was restored to the previous build. I tried...

The copy of windows has already been validated. I just noticed that after uploading and configuring, just when upgrade starts, I see "safe mode" in all four corners of the screen. I don't know if...

It has already been verified.

It worked fine on three computers, but my Lenovo Yoga 2 keeps throwing out the new and restoring the old.

My attempts to install 10240 keep restoring to previous version. Anyone else had the problem? I just cleaned the registry and I am trying it again, for the fourth time.

I have been on the Win 10 fast track with four computers since the start. All upgrades have been successful until 10240 fails to upgrade on my Lenovo Yoga 2 laptop. It gets to about 19 percent and...

I have upgraded 4 computers to windows 10, Three of them to 10240 successfully. My Lenovo Laptop however keeps rolling back to build 10166. I noticed that I was getting an indication of safe mode...