Is there a limit to users imported ?
This would only be limited by the server and PHP configuration. On the osTicket side you can import as many as you want.
Can I make Email field not a mandatory field?
No, our system is an email-based system and each user and agent have to have a unique email address. We use the email address as the unique identifier.
Cheers.
Okay many thanks for you 
Pls in case of changing email of users after registration
is The tickets created on oldest email tracked to now email or not?
Can I add clickable icon for social media in os ticket interface 
You must customize the codebase to accomplish this. There are no guides on customizations so you are on your own.
Cheers.
Can I mark on all users to mark on " Password Reset Required" instead of doing it separately in managing user?
Users or Agents? For Users you can mass send Password Reset Emails. For Agents you must do it one by one.
Cheers.
Can I make this feild besides instead of being separately in separate raw
Hi
Can I add auto reply msg. For each ticket after receiving it automatically by the app.
Is this auto response sent on email or in the app.?
osTicket does not have in app alerts.
All alerts are via email.
