Question : DB Mirrioring between MS SQL2005 Standard and Enterprise

I am trying to setup  DB mirroring between two different versions of MS SQL 2005.
Standard version as a principal and Enterprise version as a mirror ( No Witness ).
SQL books online says that two servers must have exact same version.
Is it impossible to mirror between Std and Enterprise versions?

Thank you for your help

Answer : DB Mirrioring between MS SQL2005 Standard and Enterprise

What you are looking for is:

While you can mirror from a 32-bit version of SQL Server to a 64-bit version of SQL Server and vice versa, you cannot mirror between different editions of SQL Server (for example, from Enterprise Edition to Standard Edition). The exception is that you can mirror from the Enterprise to the Developer Edition because both have the same engine (the Enterprise Engine). However, the Developer Edition is not licensed for production use.

The witness can be any version of SQL server.

Note: You don't need an additional license for the mirror server if it is just acting as a backup, i.e. running passively