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Access CustomProperties settings using Office365 APIs from EWS or REST APIs

I have an office e-mail application office that stores a value in a user property until the item is saved. When the item is saved, I want to access this property using the server application. Reading the documentation on custom properties tells me that I cannot access custom properties created using the JS API using any other service such as EWS, as these are not MAPI properties. Are there any workarounds? Is it possible to access them using the REST API?

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Actually, this is documented where they are stored and in what format. The specification [MS-OXCEXT] provides the specifics. Basically, the values ​​are stored as a JSON dictionary in the user property of the element. You should be able to use EWS to read this custom property as ExtendedProperty.

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