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To activate your product over the telephone, use one of the following numbers: 1  Windows activation: (888) 571-2048. 2  Microsoft Office activation (United States only): (888) 652-2342. 3  TTY number: (800) 718-1599.  If you are an international customer, find the telephone number from the following list: Country/region. Volume License Keys only toll call.
Call your bank. If you opened a bank account using your EIN, call them and ask them to secure the number. Go in to the bank, and provide proof of your identity. You can also look on your bank statements for the number. (Some banks print them, others do not.) Call the IRS's Business and Specialty Tax Line toll-free at 1-800-829-4933 and ask them to locate your number.