Thank you for your thorough reply.

Transactions always commit at the Primary, by using either synchronous or asynchronous sessions you're just controlling whether they are passed immediately to the mirror and...

Is anyone able to clarify?

My post seems to have been lost

Essentially my research allowed me to conclude the following:

Leaving the WITNESS in place it a very bad idea when the secondary/mirror server is going...

The secondary.

I have just posted a reply with my research so far.

I have read the following related posts:

http://www.sqlservercentral.com/Forums/Topic1160643-391-2.aspx

http://www.sqlservercentral.com/Forums/Topic1270176-391-1.aspx

From these I have been able to gather the following:

With a FULL safety mirror with a Witness server, if the...