Mission Orders Lite is at:
http://www.mediafire.com/?z4zznx4wzka
This will give you important messages plus ones specific to events scripted in GWX. If you get a message about a certain event, it will be happening and there are only 228 messages throughout the campaign.
Mission Orders is at:
http://www.mediafire.com/?cz2y2nzoolg
This will give you the info above plus news messages about events as they happened in WW2 - the best way to describe it is like a small history lesson through your radio messages.
When it comes to standard GWX messages:
If it is in lat and long it is immersion
If you get a grid (e.g. AN46) then it is scripted.