+When an app makes a [JSON batch](json-batching.md) request that consists of multiple, _unordered_ individual requests to the Outlook service, by default, Microsoft Graph sends the Outlook service up to four individual requests from the batch at a time, regardless of the target mailboxes of those requests. The Outlook service can execute these requests in parallel at any point, also irrespective of the target mailbox. Since Microsoft Graph sends only up to four requests to run in parallel, the execution of that batch stays within [Outlook's concurrency limits for the same mailbox](#limits-per-mailbox), regardless of the app used.
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