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                                            HenryLehloo

"System.ArgumentOutOfRangeException: index is out of range." exception is raised while saving an item with ItemAttachment

I am having the same issue as well. I'm new to this and how do I implement @GeoffreyYue1 solution? Where do I find ComplexPropertyCollection.cs, im using EWS.

"System.ArgumentOutOfRangeException: index is out of range." exception is raised while saving an item with ItemAttachment

@laeeq can you please provide the DLL, thank you very much.