Opening ArcGIS maps in exploerer

[AlaineHilty1]

When I go to open a map, I have three options, open with either Arcgis explorer online, Arcgis.com map viewer, or Arcgis 10 for desktop. But when my coworkers go to open a map I have created, they don't have the option of opening in Arcgis explorer online. Why is this? I'd rather have them open the maps in explorer.

[ShellyGill2]

If you're opening web maps, then as far as I know, you do not see the Explorer Online option if the browser does not have the Silverlight plugin installed.

If you send your co-workers a specific Explorer Online link to a map, then if they do not have Silverlight installed, they should see a page which allows them to install it. Click the Share button within your map, then use either of the Copy buttons to copy a link to directly open the map or presentation in Explorer Online, for example:
http://explorer.arcgis.com/?open=153c17de00914039bb28f6f6efe6d322