EXCHANGE 2010, OUTLOOK 2016

Is the user's email address hidden from the GAL?

no

Seems like the autoconfiguration is acting up.  Do the easiest thing first, remove the outlook profile and readd it.

Can you provide more details? Is the user inside or outside of the office? Laptop/desktop? Can you access the email account via OWA?

this user was migrated from 1 domain to another domain, it is inside office, oof fails both on owa and outlook

What is the user's UPN?
Also, what the existing email addresses on his AD account?

how to check EWS for this user? is it enabled or disabled

UPN is correct

Changed domains. Is it the only user in this new domain? Is autodiscover setup for that domain on both internal and external DNS? Have you ran the exchange remote connectivity analyzer?

only 1 user is affected

how moving to another database will help?

Pramod,- on a workstation that has the outlook client working go to the hidden icons in the task bar and find the outlook icon.  Hold control and right-click the outlook icon then click "Test Email AutoConfiguration"

Compare the settings in here and on your workstation that isn't working.

Is the workstation that isn't working supposed to be in the same OU as the others? Check that as well

If it is in the correct OU, force a new gpupdate  - open a command prompt   GPUpdate  /force

Who said anything about changing to another database?

You need to provide more information here with more descriptive replies to questions otherwise it's hard for us to help.  Are there more than one user on this new domain? By domain do you mean Email domain or active directory domain? Again have you ran the remote connectivity analyzer?

Is it isolated to a single PC or to a single user?

email domain, single user

I see users properties that it is on xxmailbox server and db1  but when I type get-mailbox identity on that server  it doesn't find it

but cant find the mailbox on the said server? very surprising even it shows in properties

Pramod- you will have to start sending screenshots of errors.  You seem to be finding more issues as you go along.  Are you sure the migration was completed successfully?  Restart those pools as I mentioned.