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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.
Toll free business telephone assistance is available at 1-800-829-4933. The hours of operation for this number are also 7 am to 7 pm local time. Businesses that require assistance with E-services can contact the E-help Desk Monday-Friday from 6:30 am to 6:00 pm central standard time. The E-help Desk is staffed with IRS tax professionals who can typically handle inquiries involving E-services products. The toll-free number for this is 1-866-255-0654. However, this telephone service should not be used by those who are filing electronically using online software or tax preparer software. Those individuals or businesses should refer to the IRS live telephone assistance program or call 1-800-829-1040. Assistance for Exempt Organizations, Retirement Plan Administrators, and Government Entities can be had at the following number 1-877-829-5500.