Introduction You’ve installed an evaluation version of Windows server for testing, or training purposes. Now you want to apply a license key, but it’s not activating, and an error appears. That’s because you have to convert from evaluation to a full Version first. After that, you can insert your license key. In this article, you will learn how to upgrade Windows from an evaluation license to a full Version. The Windows license evaluation period begins and runs for 180 days.

Postfix is a free and open-source MTA (mail transfer agent) used for email routing. When emails are sent, they are placed into a delivery queue and sent to the destination. On occasions where postfix cannot deliver/forward email, they will be placed into the deferred queue. This article outlines how to flush the queues - flushing will ask postfix to attempt to re-send emails struck in the queue. Please note that you must be logged in as root to see the email queue and to run postfix commands.