one more question?

As per BOL http://msdn.microsoft.com/en-us/library/ms189434(v=SQL.105).aspx

when using windows authentication, SQL Engine account should be domain account for configure database mirroring.

as per my current instance can login mixed mode authentication such as users 'sa', 'administrator'

Can we use like this as below

Principal

Specify the service account of the principal server instance.

Principal servername\Administrator

Mirror

Specify the service account of the mirror server instance.

Mirror servername\Administrator

But SQL server service account running local user account for example

1. Principal servername\SQLServEngine - for MSSQL

2. Principal servername\SQLServAgent - for Agent

Both user added into login at sqlserver instance.

thanks