Based on our record, ArcGIS Explorer Desktop seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You need ArcGIS Desktop to open MXDs but if they can export a PMF you can use ArcGIS Explorer. Source: about 2 years ago
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