Select the ParametersSystem subkey, click Edit > New, and then select DWORD (32-bit) Value. \\HKEY_LOCAL_MACHINE \SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem. Go to the following location in the registry: For example, press Windows key + R, and then run regedit. Before editing the registry, back up any valuable data. Problems resulting from editing the registry incorrectly may not be able to be resolved.
Incorrectly editing the registry can cause serious problems that may require you to reinstall your operating system. To increase a session limit in the Client Access (frontend) services, you need to use the Set-ThrottlingPolicy cmdlet in the Exchange Management Shell. If you don't make the same changes on all servers, the results will be inconsistent. When you modify a session limit, you need to modify that limit on all Mailbox servers within a database availability group (DAG). Use the following procedure to modify the default session limits. Outlook on the web (formerly known as Outlook Web App) Client typeĭefault number of user sessions per mailbox database The types of client connections to the Managed Store and the limits based on those connections are described in the following table. Max user sessions per process: The maximum number of sessions for a specific protocol for a single user.
Max sessions per process: The maximum number of sessions that an Exchange service can have open at one time on a mailbox database. Session limits are based on connections per mailbox database on the server. The exception is the Availability service, which has a maximum limit of 16 per user. That execution of the request is a single thread.įor all clients, the maximum number of threads per mailbox database is 50. For example, if a user opens a folder in Outlook, Outlook executes a request to the Managed Store on behalf of the user. Threads represent concurrently executing requests to the Managed Store. The terms connections and sessions can be used interchangeably. Services and clients can have multiple sessions at a particular time. Sessions represent the connections used by services and client applications (for example, Microsoft Outlook) to connect to the Managed Store. Knowledge of the following terms will help you understand the types of connections referenced in this topic. Connections by administrator accounts have maximum session limits of 64000.Įxchange Online limits (including Managed Store limits) are described in the Exchange Online Limits.
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