While installing Office 365, some users sometimes come across Error Code: 17002. The system returns this error message subsequent to installation. This issue occurs when you have either Office 365 or any other older version of MS Office already present on your PC. If your system keeps crashing or does not let you work with Office due to this, call MS Office 365 Technical Support Number +1-800-449-1424. You can contact us for any issue or query concerning Office 365. You will receive the best services when you contact our helpline number. Our toll-free number is open 24x7, for your help and you can call us anytime round the clock to receive any assistance.