Exchange OData Connector 25.3
Exchange OData Connector Help

# Respect Graph API Limits

The Microsoft Graph API does not permit more than four concurrent connections to the same mailbox. (For information about throttling in the Graph API, refer to the Microsoft documentation). OpenText recommends that you configure the connector to respect this limit. This section describes some of the configuration parameters that you can use.

The main scenario to consider is when you use the connector to synchronize with Exchange. To synchronize as quickly as possible, the connector uses multiple threads. Each thread opens its own connection. The number of threads to use for a synchronize task is controlled by the parameter `SynchronizeThreads`, so you could set `SynchronizeThreads=4`.

NOTE: The default value for `SynchronizeThreads` is `5`. The default configuration file provided with the connector sets this parameter to `3`, but you might need to reduce this further.

There are other reasons, apart from scheduled synchronize tasks, why the connector might open a connection to a mailbox. For example, users of a front-end application might cause the application to send `fetch` or `view` actions to the connector. The connector can handle multiple actions simultaneously. The parameter `MaximumThreads`, in the `[Actions]` section of the configuration file, specifies how many asynchronous actions to process concurrently. The parameter `Threads`, in the `[Server]` section, specifies how many synchronous actions to process concurrently. Any `fetch` action (synchronize, collect, delete, insert, and so on) is asynchronous by default. The `view` action is a synchronous action.

The following configuration would allow up to one concurrent `fetch` action, and two concurrent synchronous actions (including actions such as `getstatus` or `view`):

    [Fetch]
    MaximumThreads=1

    [Server]
    Threads=2

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Version 25.3 | Last updated July 2025

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Product: Knowledge Discovery Exchange OData Connector 25.3

Topic Title: Respect Graph API Limits