Message Id's are known to change on move/copy/etc... But are they ever repeated?

Question

Lets say I run the request GET https://graph.microsoft.com/v1.0/me/messages

I get back a list of Message objects. According to the documentation here

id (string) - Unique identifier for the message (note that this value may change if a message is moved or altered)

However, is this id ever repeated? Currently I am making a scheduling plugin that saves some message draft id to a database before attempting to send it at some specified later date

I know that if the message is moved or altered that the id will no longer be valid. But would it ever accidently point to a new (but different) message?

In other words, are the ids every reused?

score 4 · Answer 1 · answered Apr 23 '17 at 15:58

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The ID property is a compound value which, among other things, includes the message's path and it's unique identifier. This is why the ID will change when a message is moved to another folder but still maintain a unique value.

answered Apr 23 '17 at 15:58

Marc LaFleur

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score 2 · Accepted Answer · answered Apr 23 '17 at 06:49

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No. Ids are never repeated as far as I can say.

answered Apr 23 '17 at 06:49

Yogesh

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score 1 · Answer 3 · answered Apr 24 '17 at 00:19

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I just confirmed with the store team, mids (the message Id portion of an entry id) are never reused.

answered Apr 24 '17 at 00:19

David Sterling - MSFT

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Message Id's are known to change on move/copy/etc... But are they ever repeated?

3 Answers3