What is a transfer window?
If you are attempting to transfer a domain name away from Fabulous the Registrar-Lock must first be removed, so that the domain is "Active" status.
A transfer window is a predefined period of time during which a domain is "Active" status. By default, the transfer window is 5 days long. At any stage of the transfer window you can cancel it, or extend it for another 5 days. When the transfer window expires, the domain will be automatically relocked.
Using a transfer window allows you to unlock a domain name for a sufficient amount of time to transfer it out, without running the risk of accidentally leaving the domain unlocked indefinitely.
To unlock a domain name and open a transfer window, use the "Bulk Transfer Window" tool or the "Transfer" button next to the individual domain name in the in the "Manage" -> "Domains" area of your account.