You can import email messages from any other mail service to your Gmail account. For this you have to sign in to your Gmail account and then go to 'Mail Settings'. Here, select the 'Accounts and Import' tab and you will see an option for 'Import mail and Contacts'. Click on it and a new window will open up asking you to enter an email account. Enter the email address from which you want to import the data and click on next. On the page that opens up, enter the password to your mail account for authentication. Once your password is approved, Gmail will give you options to import mails, import contacts and add a specific label to all imported mails from the other account. Next click on import to start the process. It can take upto 2 days for all your mails and contacts to be transferred to your gmail account depending upon the number of email messages stored. To check the progress, go to Settings > Accounts and Import and under the 'Import mail and Contacts' header you will see the number of added emails. Under each email address, it will show you a status: Importing or Imported.