Where is the line usually drawn between macroevolution and microevolution?

I thought that, although similar processes govern both, the line was at the species level, with macroevolution being changes at the above-species level and microevolution being changes within a species (something like changes in allele frequencies). (So it's a question of timescales?)

However, I heard someone talk about microevolution among different species of Drosophila, specifically referring to copy number variation. Was the choice of "microevolution" to describe this process (more likely) due to the similarity between Drosophila species or the type of change in the gene? Or at this level, is the distinction rather arbitrary?