Sometimes standard integration don't give you the flexibility and control you need while integrating two business systems. At GS1 Australia iManager was used to manage complex integrations between Dynamics 365 Operations and Dynamics 365 Customer Engagement.
Australian Technical Services
When you have a lot of disparate systems and standard integrations are not available there is a lot of double handling of data and lot of time is spent on double keying data that someone else already has entered into another system before.
Besides a loss in productivity this can lead to mistakes in data entry, delays in getting paid by your customers and will prevent you from getting a real-time view of how your business is tracking.