Instead of paying for a legacy key, consider these free or low-cost alternatives:
| Tool | Cost | Compatibility with Project 2007 | Best For |
| :--- | :--- | :--- | :--- |
| ProjectLibre | Free (Open Source) | Opens and saves .mpp files (limited support for advanced macros). | Individuals who just need to read old .MPP files. |
| GanttProject | Free | Imports .mpp files; exports to HTML/PDF. | Simple Gantt charts without Microsoft bloat. |
| Microsoft Project Plan 1 (Web) | ~$10/user/month | Cannot open .MPP files natively (requires migration). | Teams that want modern collaboration. |
| Office 365 (Desktop) with Project Online | Subscription via Microsoft | Yes, the latest Project Professional 2021 can open and edit 2007 files. | Businesses with legacy .MPP archives. |
Recommendation: If you only need to view an old Project 2007 file, download ProjectLibre. If you need to edit many old files, subscribe to Microsoft Project Plan 3 for one month, bulk-convert your files, then cancel.
When purchasing Microsoft Office Project 2007, you will receive a product key. This key is essential for activating your software. Here are some legitimate ways to obtain a product key:
If you have previously purchased a legitimate copy, do not panic. The key is often hidden in plain sight. Here are the most common locations: