C:\MyLoTWCertificates .
Callsign Certificates are valid for 3 years. To determine when a Callsign Certificate will expire,
| 1. | Start TQSL and select the Callsign Certificates tab, which lists your Callsign Certificates. |
| 2. | Click on the Callsign Certificate in question, and then click the Display Callsign Certificate button; a Certificate Properties window will display the Certificate's expiration date: |
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A Callsign Certificate that has already expired is shown on the Callsign Certificates tab with an expired icon: 
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Once a day on startup, TQSL will inform you if a Callsign Certificate will expire within 60 days, and you will typically receive an email notification from the ARRL a few weeks before a certificate expires.