I have one copy of FSX deluxe for my desktop and one for my laptop so i can host a server and log in to it from my pc. The first attempt i tried was to use the one copy of fsx and activate it on both computers, this activated with out error. Once i connected to my laptop over the LAN an error msg popped up on my desktop stating that Duplicate licence id's were detected. I then bought another copy of FSX and uninstalled FSX on the laptop then re-installed the brand new copy and activated it online with out any problems, however the error or duplication still appears... Did i not remove it completely? not sure where these licence keys are stored but its not a duplication anymore. Very fustrating.
1 Answers
Call, they should be able to help.
http://www.microsoft.com/licensing/existing-customers/activation-centers.aspx
When you deleted FSX and loaded the new one there may have been some lines left in the registry that needed cleaning out.

Still stuck on this question?
Ask Fly Away, our AI flight sim & aviation assistant, for an instant answer to this exact question — or ask the community below.
FSX — recently answered
FSXHow do I configure Aerosoft Airbus callouts in FSX?Configure Aerosoft Airbus callouts in FSX: enable MCDU crew and checklist audio, set approach…Read answer →FSXHow do I install Aerosoft Airbus X liveries in FSX?Install Aerosoft Airbus X liveries in FSX by utility or aircraft.cfg, with manual steps and…Read answer →FSXHow do I install and fly the Trident in FSX?Install and fly the Trident in FSX or Steam Edition with the correct folders, required update…Read answer →FSXHow do I use the Aerosoft Airbus X Fuel Planner in FSX?Use the Aerosoft Airbus X Fuel Planner in FSX: enter payload, distance and reserves, generate…Read answer →
Trainee
Chief Captain