The phone number for Office 365 tech support for the United States is 1-800-865-9408. A customer can contact support 24 hours a day, seven days a week. Administrators can reach support through the same number. Customers receive tech support in English 24 hours a day.
Office 365 offers different phone numbers for different countries or regions. Local charges may apply when calling the phone number for Office 365 tech support. If the purpose of calling is not critical, a person can seek help from Office 365 online community forums at Community.Office365.com. Administrators also can use the Office 365 admin center for a faster resolution.