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Update message-delta.md with delta query notes #9760

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Update message-delta.md with delta query notes #9760

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1b28ddb
Update message-delta.md with delta query notes
gabrielquijadaf-source Dec 22, 2025
e6e2783
Clarify reason for @removed entries in delta queries
gabrielquijadaf-source Dec 23, 2025
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13 changes: 13 additions & 0 deletions api-reference/v1.0/api/message-delta.md
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Expand Up @@ -74,6 +74,19 @@ _id_ property is always returned.
an `$orderby` expression, the return order is not guaranteed.
- There is no support for `$search`.


> [!NOTE]
> Delta queries for messages can return change events that don't match the filter conditions specified in the initial request.
> These include:
>
> - `@removed` entries with `"reason": "deleted"` when an item is deleted or moved from the folder.
> - Read/unread state changes.
>
> These events do **not** originate from changes to the message itself. They are emitted as part of the folder‑level synchronization process that delta tokens rely on.
> Delta tracking operates at the **collection** level, not the message‑level, and therefore these events are **not filtered out**.
>
> Clients should be prepared to handle such entries to maintain an accurate and fully synchronized local view of the message collection.

## Request headers
| Name | Type | Description |
|:---------------|:----------|:----------|
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