Random OUs feel harmless on day one and expensive on day three hundred. This page shows the two layouts that work - by site and by department - and how to choose between them honestly.
Ask ten admins why their OU tree looks the way it does and nine will say it just grew. The problem: every Group Policy and every delegation decision later has to climb that tree, so a tree built on moods makes simple changes confusing. OUs exist for exactly two jobs - applying policy and delegating control - so the tree should mirror the things those jobs follow: where people work, and what work they do. This page compares the two honest layouts and the traps inside both.
Both layouts are legitimate. The right one is the one that matches who supports the users and how policy differs.
Site-first wins when each branch has its own support person, its own printers and shares, or its own working hours. Delegation becomes one clean sentence: the Jaipur support person controls the Jaipur Office OU. Internet links and update schedules also differ by site, and site-first OUs let policy follow that. Most multi-branch Indian offices end up here, and it is the layout used in the video.
If a single IT team serves all branches and policy is really about the job - accounts staff get the accounting software and tighter USB rules wherever they sit - department-first reads better. The cost: branch-level jobs like redirecting a new computer OU per site get slightly awkward. Neither layout is wrong; mixing both logics at the same level - one branch OU beside one department OU - is the actual mistake, because nobody can predict inheritance after that.
Whichever layout you pick, split each unit into Users, Computers and Groups children. User policy and computer policy are applied to different OUs, servers should never sit with workstations, and a flat list of groups inside their own OU makes permission audits readable. It costs three extra clicks on day one and saves hours on every audit day after.
You do not need a weekend shutdown to fix a bad layout. Create the new OUs beside the old ones, move a small pilot group of users first, confirm logon, drives and printers still work, then move the rest department by department. Moving an object between OUs changes which policies hit it, so move in small batches and check after each batch - honestly, most redesign pain comes from moving everyone at once on a Friday evening.
The full OU, user and group creation process - live on a real domain controller, step by step.
▶️ Watch Full VideoYes. Moving users between OUs does not change their account, password or group memberships - only which Group Policies apply. Move a few test users first, confirm policies look right with a logoff and logon, then move the rest in batches.
Always. Servers need different update, logon and security policy from workstations, and they should never inherit workstation settings by accident. A top-level Servers OU, split by role if the fleet grows, is the standard pattern.
The number is not the problem - unpredictability is. Thirty OUs in one consistent pattern are easier to run than eight OUs in three mixed patterns. Keep one logic, keep it shallow, and document it on one page.