Cannot get Immutable IDs

Question

I'm trying to get Immutable IDs for messages but I haven't able to get them. Here's what I tried to do:

endpoint : https://graph.microsoft.com/beta/
Header: added Prefer: IdType="ImmutableId" (I had to use the escape "\" character to use the quotes)

I did my message list request before and after a change to the message's parent folder but the message "id" is not immutable.

Do we get any indication that the "Immutable" preference has been taken into account ?

Is it better that I switch to Outlook API (v1.0 or v2.0) to get the immutable IDs ?

Thanks for your answer.

mirik · Accepted Answer · 2019-08-04 14:45:58Z

1

You have to add header Prefer: IdType="ImmutableId" in both places, when you create a subscription and when you move the email.

answered Aug 4, 2019 at 14:45

mirik

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Seiya Su · Accepted Answer · 2018-11-25 21:59:26Z

0

Do we get any indication that the "Immutable" preference has been taken into account ?

Just waiting for the official states, any indication is not necessarily reliable.

Is it better that I switch to Outlook API (v1.0 or v2.0) to get the immutable IDs ?

Yes for real production applications, beta version is mainly for test/preview.

Important: APIs under the /beta version in Microsoft Graph are in preview and are subject to change. Use of these APIs in production applications is not supported.

answered Nov 25, 2018 at 21:59

Seiya Su

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