You will have to use our version if you wish to play multiplayer with us. However, as CK9 already mentioned, you can keep your CD version around if you wish to have it.
As far as our version goes, it doesn't contain any movies or music. If you want to have movies / music when you play do one of the following:
- Insert the CD when you play, or
- Go to the outpost2\ directory on the CD, and copy op2.clm, music1.wav, and all .avi files to the OP2 installation folder.
Welcome, and hope to see you on IRC sometime!
Edit: and no, they aren't 'official' in that Sierra / Dynamix or anyone like that released them. All patches beyond the 3 scenario packs that Sierra released on their website were done by the community.