180 Days of Free Windows Server: Living with Evaluation Editions

Hi there! It's BOB.

Here's some happy news for home labbers: Microsoft lets you download and run Windows Server for free for 180 days. No credit card, no catch, just a countdown timer.

That's the evaluation edition, and it's how most home labs start. Today let's look at how it works, how to see how much time you have left, and your options when the clock gets low.

Where to Get It

Head to the Microsoft Evaluation Center and pick your Windows Server version. You'll fill in a short form, then choose an ISO (great for Proxmox or Hyper-V) or a ready-made VHD.

The evaluation is the real Windows Server, with a few twists:

• It's fully functional: Datacenter or Standard, with or without the desktop.
• It runs for 180 days from the time you install it.
• It's meant for evaluation: learning, testing, labs. Not your production web store.

💡 BOB's tip: Windows 11 Enterprise has an evaluation too, at the same Evaluation Center. It runs for 90 days, which is plenty for testing Group Policy and client stuff against your lab domain.

How Much Time Do I Have?

The desktop shows it in the bottom-right corner. For details, ask the Software Licensing Management Tool:

slmgr /dlv                   # detailed license info: edition, time remaining, rearm count
slmgr /xpr                   # just the expiration date
DISM /online /Get-CurrentEdition   # an "Eval" in the name means evaluation

In the slmgr /dlv window, look for:

• Description: includes TIMEBASED_EVAL on an evaluation.
• Timebased activation expiration: minutes left (do the math, or just use /xpr).
• Remaining Windows rearm count: how many times you can extend. Keep reading!

Option 1: Extend It (Rearm)

When the countdown gets low, you can rearm the evaluation, which resets the timer:

slmgr /rearm
Restart-Computer

After the reboot, slmgr /dlv shows a fresh 180 days and a rearm count that's one lower. You can only rearm a limited number of times, so check that remaining rearm count rather than trusting the internet (people report different numbers for different versions).

⚠️ Heads up: Rearm before the timer hits zero. It's much more pleasant than doing it on a server that's already in a bad mood.

Option 2: Convert It to a Full Edition

If you have a real product key (from a retail license, a Visual Studio subscription, or work), you can turn an evaluation into a full edition without reinstalling. Microsoft calls this converting the edition, and it's done with DISM:

# 1. What am I now?
DISM /online /Get-CurrentEdition                # e.g. ServerDatacenterEval

# 2. What can I become?
DISM /online /Get-TargetEditions                # e.g. ServerDatacenter, ServerStandard

# 3. Become it!
DISM /online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula

It reboots (sometimes twice), and you're a full edition.

A few rules from Microsoft's documentation:

• Only targets listed by /Get-TargetEditions work. An evaluation of Datacenter can only become Datacenter.
• Desktop Experience stays Desktop Experience. You can't convert a desktop evaluation into Server Core.
• Domain controllers can't be converted. At all.

⚠️ Heads up: That last one catches everyone. If your evaluation DC is running out of time, build a new domain controller on a full edition, move the FSMO roles to it, then demote the old one. Or, in a lab, it may be time to rebuild anyway!

Option 3: Let It Expire (Please Don't)

What happens if the timer runs out? According to a community article in Microsoft's archived TechNet Wiki (and plenty of unlucky lab users), an expired Windows Server evaluation:

• Shows a reminder that it's expired, and
• Shuts itself down every hour.

That's not a good look for a domain controller, a DNS server, or anything else other machines depend on. Rearm, convert, or rebuild before then.

Option 4: Embrace the Rebuild

Here's a secret the pros know: in a lab, rebuilding is a feature. If your servers come from a template (my Proxmox Sysprep article covers that), a fresh server takes minutes. Every rebuild is practice for the real world:

• Can you rebuild your domain controller from your notes?
• Does your PowerShell script still set up the file server?
• Does your CA come back with the same name and templates?

If the answer is "yes," the 180-day timer stops being scary. It's just a reminder to practice. 🙂

Licensing, the Friendly Version

I'm a friendly guy, not a lawyer, so here's the short and sweet version:

• Evaluation editions are for evaluating, learning and testing. A home lab is exactly that.
• Rearming is a built-in feature, documented by Microsoft.
• For long-running or production use, get a proper license. Visual Studio subscriptions include Windows Server for dev and test, which many lab users already have through work.
• When in doubt, read the license terms that come with the software. (DISM even saves a copy for you with /GetEula.)

Wrapping Up

• Windows Server evaluations are free, fully functional, and last 180 days.
• slmgr /dlv shows the time left and the rearm count; slmgr /rearm resets the clock a limited number of times.
• DISM /Set-Edition converts an evaluation to a full edition with a real key, except on domain controllers.
• An expired evaluation shuts down every hour. Don't let it get there.
• Templates + rebuilds make the whole thing painless.

Happy (free) labbing!

See you next time!

— BOB

Sources

• Microsoft Evaluation Center: Windows Server
• Microsoft Evaluation Center: Windows 11 Enterprise
• Microsoft Learn: Convert Windows Server editions and license types
• Microsoft Learn: Slmgr.vbs options for volume activation
• Microsoft Learn (TechNet Wiki archive): Windows Server: extend an expired evaluation period
• Microsoft: Visual Studio subscriptions