RobA, it would help, but it depends on the format of the source file. Though I could open most source files in their native formats, a preference for TIFF, PSD, or other file at 300 ppi for a letter sized final map size. I don't want JPGs as a final map, but Entry WIPs should probably be in JPG format. Final entries Emailed to me for publication use.
Simple answer, yes.