We are running Cisco Unity 2.4 with a 200 user license. There are 170 active users and we have probably deleted approximately 30 users over the last year. We are unable to add another user now on the basis that our licensing limit has been exceeded (according to the message), and sure enough, the license count indicates 200 in use and 200 licenses.
Is this a matter of needing to "really" delete some users, compacting some database or are the licenses actually issued "per person"?
Try running the license syncher in the Unity program group - this will force a walk of the database and a full recalculation of the number of used licenses. This normally runs every night but it's been pretty common practice to disable it from auto running some time ago when there were some bugs in it causing the CPU to spike in some cases - it could be disabled on your box.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.