Atlassian ENDS the sale of Jira & Confluence server licenses forever on Feb 2nd, 2021. They want everyone to move to the cloud. So get yours before they're gone.
Estimates are a fundamental element of Scrum. Because they are the basis for planning and predicting when work will be completed. Like Sprints, if you’re not using Sprints and estimating, then you’re not using the Scrum framework.