Migrating osTicket from one server to another is relatively easy, but there are a few sticking points. At this point we assume that you already have a webserver setup and serving an empty site, and have PHP and MySQL/Maria installed.

1. Back up the old database. You can do this in a number of ways, but the easiest is to simply export the database.
2. Back up the old site files. You can do this a number of ways also, but if it were me I would SFTP into the server and download the site files.
   note: if you are running the Attachments::Filesystem this step can take a significant amount of time depending on the number of attachments.
3. If you haven't yet, make sure that your webserver on the new Windows server works. You should at this point make sure that you have enabled the extensions that osTicket needs. You can look at the Admin panel -> Dashboard -> Information to get a list. In Windows you enable these in the php.ini file. You can check php by making a test.php and in it putting <?php phpinfo(); ?> and then browsing to the site/test.php in a web browser.
4. Setup your DB User, and create the database. IF you use the same username/password, and database name you can save some time here. Make sure that you grant privileges to the new user to the database.
5. Import the database from the backup you made.
6. Put the site files into the new site from your site back up you made.
7. Once they are there, try browsing to the site.

At this point the migration should be done. IF you have any issues check your PHP and [unknown] webserver error logs and report them here.

If it were me I would:

On the Linux box you would use mysqldump to drop the db to a file. Open a command prompt and

mysqldump -u [username] –p[password] [database_name] > [dump_file.sql]

The parameters of the said command as follows:

[username] - the databases MySQL username.

[password] - the MySQL password for the user.

[database_name] - the Database name you want to take backup.

[dump_file.sql] - The name of backup dump file you want to generate. I usually use databasename_YYYYMMDD.sql.

On the windows server install MYSQL Workbench (from mysql). Transfer the .sql file you created from the Linux box to the Windows box. Launch MySQL Workbench, connect to the MySQL instance, and then click import. Select the file. (see MySQL workbench documentation or Google for more information.)

You appear to have your email configured to use localhost to send emails.
You would need to update your email config to use a mail server.

Go to: Admin panel -> Emails -> Emails
Click on the email you want to configure.
Enter the settings for your mail sever.
Click Save Changes button.

You mention an error, but have not provided us with what it is.

ashutoshthakur3 Also wanted to know where to change is mail server setting on OST php code or in Windows server

To configure mail at the PHP level you would look at your PHP.ini for the section mail settings.

It is usually labelled [mail function]
The directives are SMTP, smtp_port,sendmail_from, and mail.add_x_header in the default php.ini that comes with PHP.

There has to be an error some where.
If you do not see anything in the PHP error log, then check your webserver and mysql error logs

ashutoshthakur3
Take a look at this post, it's little dated but it's same process for LDAP:
https://tmib.net/osticket-1-8-1-how-to-configure-the-ldap-authentication-and-lookup-plugin/

For CRON Job:
Create a .bat file
add to task scheduler whatEverYour.bat file.

C:\Program Files\PHP\YourPHPversion\php.exe -f c:\inetpub\YourOSticketPath\api\cron.php