To reach technical support for Microsoft Office 365 Dedicated (O365-D), use the telephone numbers in the following table to contact Microsoft Online Services Support.
Be aware that Office 365 Dedicated and ITAR are distinct service offerings. For support with other service offerings, including Office 365 Enterprise, Office 365 Small Business, Office 365 Education, or if you are unsure which service that you are subscribed to, please check the Support for Microsoft Office 365 page.
BPOS-D support phone numbers
Use the number that corresponds to the country from which you are calling.
0800 001 449
0800 032 3138
0203 450 5647
(877) 9MOSSUP (877) 966-7787
BPOS-ITAR support phone numbers