1. Total number of licenses cannot be reduced to less than the number of currently ‘Active’ Users.
  2. Total number of licenses cannot be reduced to less than the minimum required number of licenses. For example, you cannot reduce the number of licenses for ‘Dropbox Business – Standard’ service plan to less than 3 licenses.
  3. The Minimum number of License for Dropbox business is 3 Units/ 5 Units (for Legacy subscription).
  4. The Maximum number of License for Dropbox business is 1000 Units.

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  5. To upgrade or check the Dropbox resource limits follow the article how to check/Upgrade Dropbox License.