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Note

These system requirements apply to versions higher than 7.5 of Optimizely Content Management System (CMS). See Install updates to CMS. See requirements and deviations below for product and service-specific requirements.

## Server requirements

### Operating system

Any of the following:

  • Microsoft Windows Server 2022

  • Microsoft Windows Server 2019

  • Microsoft Windows Server 2016 (End of support January 2022, Microsoft offering extended support options until January 2027)

  • Microsoft Windows Server 2012 R2 (End of support, Microsoft offering extended support options until October 2023)

  • All service packs are supported.

Note

From CMS 9, Windows Server 2008/2008 R2 and Windows 7 are no longer supported.

### Web server

  • CMS 11 and lower: Any of the following must be installed as part of the Windows Server installation:

    • Microsoft Internet Information Services (IIS) 10

    • Microsoft Internet Information Services (IIS) 8.5

Note

From CMS 9, IIS 7.0 and 7.5 are no longer supported.

### Database

Any of the following:

  • Microsoft Azure SQL

  • Microsoft SQL Server 2019

  • Microsoft SQL Server 2017 (End of support October 2022, Microsoft offering extended support options until October 2027)

  • Microsoft SQL Server 2016 (End of support, Microsoft offering extended support options until July 2026)

  • Microsoft SQL Server 2014 (End of support, Microsoft offering extended support options until July 2024)

  • Microsoft SQL Server 2012 (End of support, Microsoft offering extended support options until July 2022)

  • Microsoft SQL Server 2012 Express (End of support, Microsoft offering extended support options until July 2022)

    All service packs are supported.

Note

From update 163, Microsoft SQL Server 2008 is no longer supported.

### Other requirements

  • Microsoft .NET Framework 4.6.1 and higher (CMS 11 and lower)

Note

After 2015, Microsoft .NET Framework 4.5.0 and 4.5.1 are not supported. From CMS 11, 4.6.x is required.

Note

In a production environment, an instance bound license is required for cloud-based solutions. For non-cloud environments, a permanent IP or MAC address is required.

## Client requirements for EDITING

### Browser for editing

  • CMS 11 supports:

    • Mozilla Firefox, latest (b)

    • Google Chrome, latest (b)

  • CMS 10 supports:

    • Microsoft Internet Explorer 11 (a)

    • Mozilla Firefox 22-57

    • Google Chrome 45-62

  • CMS 9 supports:

    • Microsoft Internet Explorer 11 (a)

    • Mozilla Firefox 14-22

    • Google Chrome 33-45

  • CMS 8 supports:

    • Microsoft Internet Explorer 11 (a)

    • Mozilla Firefox 11-14

    • Google Chrome 12-33

(a) For Commerce Manager, see product-specific requirements. (b) Due to fast release cycles, we only support the two latest versions for these.

## Client requirements for Browsing

  • Browser for viewing: The supported web browsers for viewing depend on the implementation. Most standard web browsers are generally supported.

## Development and demonstration environment operating system

Any of the following:

  • Mac OS

  • Microsoft Windows 11

  • Microsoft Windows 10

  • Microsoft Windows 8.1 (End of support, Microsoft offering extended support options until January 2023)

  • Microsoft Windows Server 2022

  • Microsoft Windows Server 2019

  • Microsoft Windows Server 2016 (End of support January 2022, Microsoft offering extended support options until January 2027)

  • Microsoft Windows Server 2012 R2 (End of support, Microsoft offering extended support options until October 2023)

Note

From CMS 9, Windows Server 2008/2008 R2 and Windows 7 are no longer supported.

## Development tool

  • CMS 11 and lower, any of the following:

    • Microsoft Visual Studio 2022

    • Microsoft Visual Studio 2019

Notes

  • The Episerver Visual Studio integration installation requires IIS Express (included with VS 2015 and higher, can also be installed using Web Platform Installer).

  • Always install the latest updates for Visual Studio.

  • Visual Studio 2019 version 16.8 or higher is required for developing ASP.NET Core (CMS 12) applications.

## Database

Any of the following:

  • Microsoft Azure SQL

  • Microsoft SQL Server 2019

  • Microsoft SQL Server 2017 (End of support October 2022, Microsoft offering extended support options until October 2027)

  • Microsoft SQL Server 2016 (End of support, Microsoft offering extended support options until July 2026)

  • Microsoft SQL Server 2014 (End of support, Microsoft offering extended support options until July 2024)

  • Microsoft SQL Server 2012 (End of support, Microsoft offering extended support options until July 2022)

  • Microsoft SQL Server 2012 Express (End of support, Microsoft offering extended support options until July 2022)

Notes

  • The Episerver Visual Studio integration installation requires SQL Server Express (included with VS 2015 and 0 higher, and can also be installed using Web Platform Installer).

  • From update 163, Microsoft SQL Server 2008 is no longer supported.

## Other requirements

  • MVC 5.2.3 (for CMS 11)

## Product-specific requirements and deviations

### Optimizely Digital Experience Platform (DXP)

  • See Requirements for Optimizely DXP.

### Optimizely Customized Commerce

  • For Commerce Manager (Optimizely Customized Commerce back-end, removed in Commerce 14), we recommend using Firefox or Chrome.

  • ASP.NET WebForms support was dropped with version 12.1 for Commerce. Note: CMS 11.x will be the last generation of CMS with ASP.NET WebForms support.

### Optimizely Forms

  • Optimizely Forms is only supported by MVC-based websites and HTML5-compliant browsers.