Microsoft Safe Links (part of Microsoft Defender for Office 365) rewrite URLs in email and Microsoft 365 apps. At click time, the rewritten link is checked for malicious behavior before the user is allowed through.

• See the true destination without clicking
• Speed up phishing triage and incident response
• Check reputation in a sandbox or SIEM
• Build allow/deny lists accurately
• Remove tracking parameters for cleaner logs

Look for hostnames like *.safelinks.protection.outlook.com or *.safelinks.office.com containing a long query string with url= (the encoded original link).

No. Decoding is read-only. Always open suspicious targets in a sandbox or analysis VM, not on your primary workstation. Lucky for you, we have a sandbox phishing checker that safely analyzes links for you.

Partially. Decoding just reveals the url= value. Your Safe Links policies still protect users at click time inside Microsoft 365. IF you Follow the Decoded link it will bypass the 365 protection for that click.

url= is the original destination (URL-encoded). Others like data=, sdata=, h=, and reserved= are integrity and routing metadata.

Yes. Decoding lets you confirm the real destination, test direct access in a sandbox, and decide if a policy exception (do-not-rewrite) is justified.

Your decoder can optionally strip marketing/tracking parameters (e.g., UTM tags) for privacy and cleaner analytics—when appropriate.

Nearly always. Time-of-click checks catch delayed activations and payload swaps that traditional filters may miss.

Yes, via a do-not-rewrite list in Defender for Office 365. Use sparingly and review regularly.

Yes. These can be rewritten too; the same decoding approach applies.