Covered in similar/earlier post --->
https://supportforums.cisco.com/discussion/12132431/ironport-licensing-user
The 1501 users are still covered. The appliance is not going to count/disable based on any counters or usage tied to the license/feature keys.
The Sales Ops/Account team should be selling the license/feature keys based on appliance sizing, and the expected users or product environment. You should open a dialog directly with your Sales Ops/Account team or Reseller to directly answer the users per license/feature key.
If there are specific licensing questions - you can also contact our Global Licensing Operations (GLO):
https://tools.cisco.com/SWIFT/LicensingUI/Home
Licensing FAQ
Phone: 1-800-553-2447, opt 3
Request to have a case opened for GLO/Licensing.
Their email directly is: licensing@cisco.com
I hope this helps!
-Robert
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