Please follow the instructions here to set up your new account before moving your archive file(s)
Your Archive file should look like the highlighted folder in the below image.
To move this file to your new email account you simply click on it, hold and drag the folder to your new email account.
You will be asked if you are sure you want to move the file as per below
After that you are free to remove your old account if you want to.
Please click here to see the easiet way to move all your calendar items to your new email account in Outlook.