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Every now and then you'll find that you might need to delete a few licenses on your XenDesktop installation generally due to over usage, bit of a pain when a user gets this error as it displays an error about not enough licenses available.
First from where you have installed the license server run the following commands from C:\Program Files (x86)\Citrix\Licensing\LS
This will display who is currently using a license and when it is due to expire.
siobhan.andrews XDT_ENT_UD 2013.0815
stephen.dunn XDT_ENT_UD 2013.0815
steve.jerome XDT_ENT_UD 2013.0731
suzanne.ballantine XDT_ENT_UD 2013.0815
sylvia.munn XDT_ENT_UD 2013.0815
teena.omara XDT_ENT_UD 2013.0815
Next find the user who you want to delete and then type the following command.
udadmin -f XDT_ENT_UD -user teena.omara -delete
you have now released a license
Displays all the users and devices.
udadmin -list -a
Lists all features, versions, counts of licenses, and the users and devices for each feature.
udadmin -f XDT_ENT_UD -user u8.08 -delete
Releases one user from one feature.
udadmin -f XDT_ENT_UD -device dn01.88 -delete
Releases one device from one feature.