Approximately sixty (60) days prior to the renewal date of your license program, a license renewal notice will be mailed to the Site Administrator outlining how to renew your license program. To ensure uninterrupted use of Wolfram Research products, organizations that have established credit with Wolfram Research or their authorized reseller should submit a purchase order no later than thirty (30) days prior to the renewal date of their license program. Organizations with prepay status should submit a check no later than thirty (30) days prior to the renewal date of their license program.