Currently Being ModeratedSep 13, 2013 12:35 PM (in response to Jennifer@prvrbs31wife)
The simplest explanation is that they only have one device such as an iPhone and that at the present moment it is not connected to the network.
The turning red and the messages about the person's availability are always the same, whether they have removed the Apple ID from iMessages or the iPhone Number, or the device is out of range of WiFi (the Mac version does not switch to SMS like the iPhone itself does).
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.4)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously