If budget is a constraint, consider these legal free tools (though with fewer features):

| Tool | Notes | |------|-------| | Outlook’s built-in method | Reconnect OST to original Exchange/M365 account and export to PST via Outlook. Requires valid credentials. | | SysTools OST to PST Free Trial | Similar limitations to Stellar (preview only, limited export). | | Kernel for OST to PST Free Edition | Exports first 5 items per folder. | | OST to PST by Recovery Toolbox | Free for up to 10 items per folder. |

None of these provide a “free activation key” – they are permanently limited free editions.

An activation key (also called license key, product key, or serial number) is a unique alphanumeric code that unlocks the full version of the software. Without it, the converter typically runs in a demo mode with limitations (e.g., preview only, save first 20 items per folder, no export).

Stellar’s official licensing:

| Risk Category | Description | |---------------|-------------| | Security | Cracked tools may inject malware, steal Outlook data, or compromise your system. | | Legal | Software piracy can lead to fines or legal action (depending on jurisdiction). | | Data Loss | Modified converters may corrupt PST files irreversibly. | | No Support | Stellar will not provide technical help or refunds for non-licensed users. | | No Updates | Cracked versions cannot be updated safely, leaving bugs unpatched. |

| Method | Details | |--------|---------| | Direct Purchase | Buy from Stellar’s official website. Price ranges from $49 to $149 (one-time) depending on edition (Standard, Professional, Technician, Toolkit). | | Free Trial | Stellar offers a fully featured demo – previews all data but exports only 20 items per folder. No key needed. | | Discounts / Bundles | Check official promotions or authorized resellers (Amazon, CDW, etc.). | | Volume Licensing | For businesses, contact Stellar sales for multi-user keys. |