Based on Knowledge Based, we can extend Windows 2008 evalution for testing purposes.
"Evaluating Windows Server 2008 software does not require product activation. Any edition of Windows Server 2008 may be installed without activation, and it may be evaluated for 60 days. Additionally, the 60-day evaluation period may be reset (re-armed) three times. This action extends the original 60-day evaluation period by up to 180 days for a total possible evaluation time of 240 days.
Note In the Windows Server 2008 Evaluation DVD package, there is a 120-day initial evaluation period. You can extend the evaluation period to 240 days. To extend the initial evaluation and testing period, follow the steps in this Microsoft Knowledge Base article."
Knowledged Based Article also explain step by step running activation script in the system.
When the initial 60-day evaluation period nears its end, you can run the Slmgr.vbs script to reset the evaluation period. To do this, follow these steps:
- Click Start, and then click Command Prompt.
- Type slmgr.vbs -dli, and then press ENTER to check the current status of your evaluation period.
- To reset the evaluation period, type slmgr.vbs –rearm, and then press ENTER.
- Restart the computer.
This resets the evaluation period to 60 days.
Unfortunately, the KB article APPLIES TO section only lists the following versions.
| • | Windows Server 2008 Enterprise |
| • | Windows Server 2008 Standard |
| • | Windows Web Server 2008 |
| • | Windows Server 2008 Datacenter |
| • | Windows Server 2008 Datacenter without Hyper-V |
| • | Windows Server 2008 Enterprise without Hyper-V |
| • | Windows Server 2008 for Itanium-Based Systems |
| • | Windows Server 2008 Standard without Hyper-V |