User blog comment:OmegaSpruz/The Suicide Mission Over But the result/@comment-730941-20100723035252

I don't entirely understand your question, sorry. You have ME2 on PC, but also have an Xbox? The DLC is available on the PC and 360 editions.

As for importing to ME3, it's my understanding that the DLC is not essential to import properly. We don't know what kinds of consequences the ME2 DLC will have on ME3, but they won't be big ones.