In Windows10, Mail accounts lost after KB4580980 KB4580980

Question

Recently on a Lenovo Laptop the updates KB4580980 KB4580980 were installed. It was immediately obvious that all email accounts were lost except for the primarily (gmail) account. MAIL is the mail client used on this machine rather than OUTLOOK. MAIL version is 16005.13110.41006.0

Assuming that this was a glitch, I used system restore to being the system back to the pre-update state. All email accounts reappeared. Next, I let system update install the two noted updates again and the email accounts disappeared again.

As a test, I tried to recreate one of the missing email accounts. Attempting to add the subject accounts resulted in "marching periods" after the account was selected. The install would not proceed past this point.

At this point, I am out of ideas. I do not want to roll back again and lock out the offending updates. I also can not do without the missing Hotmail accounts.

Thoughts? How should I proceed? Have I stumbled on to a know problem not revealed in a Google search?

Answer 1

On my 20H2 machine, all Hotmail emailbox on Mail app run fine after installed kb4580980, the Mail app version is 16005.13318.41018.0.

So you could use Windows Update Assistant to upgrade current system to 20H2 then test result.
Specific steps:

1. Roll back to previous version, let All email accounts reappear.
2. Upgrade by Windows update assistant
3. Check email accounts state in Mail app.
4. Check updates in Settings

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