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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.
If you ask the reason for office deactivation-Microsoft allowed single user to install their Office 15 preview up to on 5 machines, as weâve installed the program from Office website online by signing with Microsoft account or Hotmail account, we need to deactivate it from there before uninstallation by signing again.ou need to complete one more step before that, that is you need to deactivate it. You will know the reason for office deactivation below and let us see how we can uninstall Office 2013 after the deactivation.