When trying to delete a user, Jira notes that he is associated with tasks. If those tasks are all on the done state, how do we delete user without reopening and reassigning closed tasks?
You do not.
You need to migrate all the assignees and reporters to other user IDs if you wish to delete a user account. Status of the issues is utterly irrelevant.
There's a standard approach though - don't bother deleting them. This way, you get a proper clean audit trail, you will still know who the user was (in some circles, that would actually make it illegal to delete a Jira user!) and you don't have to do much work.
If you do not delete a user, you should
I just did what you have suggested.
But the Number of Licenses remaining is still the same?
"Remove them from ALL groups and roles. That will stop them being assigned new stuff, named as a reporter and so-on. Most importantly, they will not be able to log in, and hence will not use one of your licences"
That sounds wrong. Go into Admin -> global permissions and look at the groups named for Jira System Administration, Jira administration and Jira users. The number of users in those three groups should add up to the number of licences used (bear in mind it de-duplicates - I'm in all three, several times in the Jira I've got open here, but I only use one "seat")
Check that a user that you've just deleted is definitely not in any of those groups.
If you're using external user management though, there might be a lag while groups are updated?
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