How do I fix Outlook Calendar Not Syncing with iPhone?

Calendars on apple iPhone are playing an important role, and syncing iPhone calendar with outlook can keep the daily events, and schedules for more daily tasks. Often, users can experience an annoying problem that is iPhone calendar not syncing with outlook calendar. No matter, what is minor or major issue, but I don’t have solutions for outlook calendar not syncing with iPhone. This technical problem is a big and hard issue, so I don’t have much experience to sort out this technical issue. Can you recommend the permanent resolutions to fix this technical problem as soon as possible?