Hello,

The recommended configuration for an Odoo server that supports 45 concurrent users would depend on several factors, such as the size of the database, the complexity of the modules used, and the hardware resources available. However, here are some general guidelines to consider:

1. Hardware resources: Odoo is a resource-intensive application, so it's essential to have sufficient hardware resources to support the expected number of users. At a minimum, you should have a server with 4 CPU cores, 16 GB of RAM, and a fast SSD storage device.

2. Operating System: Odoo supports multiple operating systems, including Windows, Linux, and macOS. However, Linux is the most recommended due to its stability and performance.

3. Database management system: Odoo supports several database management systems, including PostgreSQL, MySQL, and Oracle. However, PostgreSQL is the most recommended due to its stability and performance.

4. Web server: Odoo runs as a web application and requires a web server to handle incoming HTTP requests. The recommended web servers are Apache or Nginx.

5. Caching: Implement caching on the web server and Odoo application to reduce the number of requests sent to the database. This will improve the overall performance and user experience.

6. Load balancer: If the server is under high load, consider implementing a load balancer to distribute the load across multiple servers.

These are some general guidelines that can help you configure an Odoo server to support 45 concurrent users. 

Thanks & Regards,

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