Almost certainly not, as the mailbox and data are supposed to be deleted 90 days after your broadband service ceases. But sometimes it hangs around in the server. Run the address through the resource at https://mailtester.com. If valid, you might be able to get to the mailbox using an email client. You would need to know the password. But VM will not assist a former customer with an orphaned address except to delete the data manually.
After retrieving/backing up your data, I recommend you ask VM to delete it to ensure it is not accessed by anyone else.