Every 90 days away from the MIT campus some of you may receive a message that your license has expired.
For Microsoft Office or even Windows if that is your operating system. The licenses for those products check-in with the MIT servers while you are on campus.
They will timeout and time out provides a message that you need to enter a new license key.
If this occurs you can correct this by connecting to the MIT VPN and the license will renew. You do not need to stay connected on the VPN for more than 15 minutes.