Mark,
Thank you for the suggestions you made. I was able to use the method you described utilizing the Query Plus add-in to create the KML file and it worked perfectly. Once I opened up the KML file in ArcGIS Explorer, the popups worked exactly as they did in my ArcMap desktop program.
One thing I was wondering though, the Query Plus add in only gives the option of selecting features (in my case, polygons) utilizing solid, filled-in colors. I will need to add the KML file over an aerial photograph basemap, so I need the selection of the polygons to have just an outline color, but no fill color. Is there any way to accomplish this? If so, that would be perfect since the KML file is a single, very small file that can easily be e-mailed to other parties in remote locations. Thanks so much again for your help and I look forward to hearing any thoughts or comments anyone may have in this regard.