Re: Playing Offline?!

I don't have the trilogy editions, but did register ME1 and 2 on Origin. I never even have to have Origin running. Once they were downloaded and installed through Origin, I could just locate the games in the installation folder and double click the executables to play. This may be different from the Trilogy edition.

Mass Effect 3 can be played offline if you launch Origin in offline mode and disable your internet devices (LAN and wifi adapter) as long as the DLC has been authorized at least once. The same may be through for ME1 and 2.

Note that Origin no longer "spies" on its users. It used to scan your entire hard drive for data mining purposes, but the scanning is now limited to the Origin folder.