# Configurations for the Exchange Mailbox Journal Mailbox

After you install the application, configure your Journal Mailbox environment.

- Exchange Mailbox server

  - Create an Exchange Mailbox server

  - Configure mixed-mode Exchange Server environments

- Journal Mailbox subclient

  - Associate the mailboxes with the Journal Mailbox subclient

  - Configure multistreamed archiving

Important

Index server supports upto 2 billion emails, with basic indexing. For emails more than 1 billion, you can create another Exchange client using same Index server. This will help to protect 2 billion emails using a single/ the same Index server.

## Index Server Size With Basic Indexing

Use these guidelines to select the appropriate hardware for the index server if you do not use content indexing. In this case, archiving and cleanup operations are considered.

Component | Large | Medium | Small
--- | --- | --- | ---
Source application size | 50 TB | 20 TB | 5 TB
Objects per node (estimated)* | 2 billion | 1 billion | 350 million
Number of mailboxes** | 10,000 | 4000 | 1000
CPU, vCPU, and RAM | CPU or vCPU: 16 cores RAM: 28 GB - 32 GB | CPU or vCPU: 8 cores RAM: 16 GB | CPU or vCPU: 4 cores RAM: 8 GB
Index disk space (SSD class disk recommended) | 3 TB | 1.5 TB | 500 GB

* Based on an average message size of 100 KB.

** Based on an average mailbox size of 5 GB, and an average of 50,000 messages per mailbox.

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