It depends. The words "And" and "Or" obviously have different meanings. "And" denotes both cases, and "Or" denotes one or the other.

So the audience of your message....are some possibly addressing both? Or do all address one or the other. If former, choose And. If latter, choose Or.


huh?

I think the point is: is there an issue that is a Project A issue and also, simultaneously, an "other issue"?

Suppose for the sake of argument that the facility is flooded. EVERYTHING going on in that facility stops, and some things actually lose ground because stuff has to be repaired, replaced, or redone. Project A is among the several projects affected - at a very minimum it is not progressing on schedule. So is this a Project A issue, an "other issue", or both?