About ColdFusion 10 License

Hi,

We want to move our website to a new host, we buy the license like 4 or 5 years ago.

The current version of  ColdFusion is: 10,0,0,282462. we want to know if we migrate to the new server, can we still use the old license or do we need to buy a new one, another thing is can we still use the version 10 or do we need to update it the latest one.

If we can using the old license please tell me how. Thx