Release Notes - MIKE OPERATIONS 2027¶
Release date¶
25^th^ November 2026
Welcome¶
Welcome to MIKE OPERATIONS 2027
In this Release Note, you will find information about new features of MIKE OPERATIONS and what you need to know to install and get started with Release 2027.
MIKE OPERATIONS is a software product designed for data management and model-based forecast services for online operational control of river systems, water collection systems and water distribution systems. MIKE OPERATIONS empowers you to build real-time systems by offering flexible tools that help you deal with complexities such as acquiring and combining online data sources in preparation for real-time modelling.
MIKE OPERATIONS is a product consolidation of software tools developed and applied in projects since 2012. Hence, although MIKE OPERATIONS is a relatively new member of the MIKE product family it builds on proven software products that already serve many customers worldwide.
System requirements¶
The table below shows the fully supported operating systems. Those are systems that have been tested in accordance with MIKE's Quality Assurance procedures and where warranty and software maintenance agreement conditions apply.
| Supported Operating Systems |
|---|
| Windows 11 version 25H2 (64 bit) |
| Windows Server 2025 |
| windows server 2022 |
Note
When running a fully supported operating system as a 'guest operating system' on a virtualization platform, it is automatically downgraded to a non-supported operating system under the conditions provided above.
| Minimum hardware/software requirements | |
|---|---|
| Processor | Compatible with x64 instruction set, 2.2 GHz or higher |
| Memory (RAM) | 16 GB or higher * |
| Storage | 64 GB or higher * |
| Display | Resolution 1024 x 720 (High-Definition) or higher, 24-bit color (true color) |
| Graphics adapter | 64 MB RAM (256 MB RAM or higher recommended), 32-bit true color |
(*) The actual required amount of memory and disk space depend on the usage (application, model setup, size of data files etc.)
Installation and Prerequisites¶
Depending on your particular use case, several guides are available:
- Install MIKE OPERATIONS on a new Server, please follow this Installation Guide
- Install MIKE Modelling Workbench, please follow this Getting Started
- Upgrade MIKE OPERATIONS to a newer version (e.g. from version 2026.1 to 2027), please follow this Upgrade guide
License file and dongle¶
DHI License Management is used to configure the MIKE OPERATIONS licenses and visualise the modules available. The table below summarizes how the DHI License Management modules correspond to MIKE OPERATIONS Managers and User Interfaces.
| Licensed module | MIKE OPERATIONS User Interface/Manager |
|---|---|
| MO_DBase (*) | PostgreSQL and Microsoft SQL Server |
| MO_WorkbenchUI | MIKE Workbench MIKE Modelling Workbench MIKE Workflows |
| MO_Web_Operatior_View | MIKE OPERATIONS Web |
| MO_Desktop_Operatior_View | MIKE OPERATIONS (aka MIKE OPERATIONS Desktop) |
| MO_Data | Document Manager Favorite Manager GIS Manager Places Manager Report Manager Script Manager Spreadsheet Manager System Manager Time serie Manager Workflow Manager |
| MO_Planning | Analysis Manager |
| MO_RealTime | Job Manager Operations Manager |
| MO_Scenario | Scenario Manager Indicator Manager |
(*) If this module is not licensed, only a single user SQLite database is enabled.
Support¶
For general support, please refer to our FAQ or the MIKE OPERATIONS Online Help.
If you experience any difficulties, or if you have questions, please contact our Customer Care team.
You can also contact your local Customer Care team for support in your local language.
MIKE 2027 changes¶
Modernised .NET Platform¶
MIKE OPERATIONS 2027 ships on two frameworks. .NET Framework 4.7.2 is the legacy framework: it stays backward compatible with existing integrations, scripts and setups. .NET 10 is the new framework, where new development is happening going forward.
.NET10¶
MIKE OPERATIONS has been upgraded from .NET Framework 4.7.2 to .NET 10, bringing the application onto Microsoft's modern, actively supported .NET platform.
This upgrade provides several benefits:
- Improved performance: Access to modern runtime optimisations, improved memory management, and more efficient execution.
- Enhanced security: Benefits from ongoing security updates and improvements in the modern .NET ecosystem.
- Long-term maintainability: Moves away from the legacy .NET Framework towards Microsoft's actively developed .NET platform.
- Modern technology support: Enables better integration with modern libraries, APIs, development tools, and third-party components.
- Future readiness: Establishes a modern foundation for future MIKE OPERATIONS development and new functionality.
This transition represents a significant technical modernisation, improving the long-term sustainability and extensibility of the MIKE OPERATIONS platform.
Recommandations¶
The recommandation is to start using .NET10 except if your system requires DIMS.Core or some of the legacy MIKE adapters below.
| Manager | .NET Framework 4.7.2 | .NET 10 |
|---|---|---|
| GIS Manager | OpenStreetMap background maps only | OpenStreetMap and MapTiler background maps |
| Time Series Manager | DIMS.Core | Not available |
| Scenario Manager | all | MIKE 11, MIKE FLOOD and MIKE HYDRO River adapters not available |
| Workflow Manager | Built on Microsoft Workflow Foundation | Built on ELSA workflows |
Product invocation¶
Launch MIKE OPERATIONS 2027, MIKE Workbench 2027, MIKE Modelling Workbench 2027 or Database Management Utily 2027 from the Windows Start menu.
Breaking Changes¶
Model Predictive Control (MPC) support has been removed from the MIKE 1D adapter. Scenarios relying on MPC model objects are no longer supported.
The NWS (National Weather Service) adapter has been removed from MIKE OPERATIONS. Models using the SNOW-17, SAC-SMA, UNIT-HG or WEIGHT-TS methods are no longer supported.
MIKE Forecasting Workbench has been renamed to MIKE Workflows throughout the product. Only the displayed name changes.
Time series calculator formulas now use double quotes instead of square brackets ([ ]) to reference time series. Formulas saved with the old bracket syntax must be updated.
Downloading or importing USGS time series now requires an API key, ahead of USGS decommissioning its legacy waterservices.usgs.gov service. Existing jobs using the "Download USGS Daily Values" task and saved "Import from USGS" tools will fail until an API key (obtained from api.waterdata.usgs.gov) is added.
MIKE SHE now only supports rivers coupled as MIKE 1D models (.m1dx, from MIKE HYDRO River or MIKE+). Registering a MIKE SHE setup whose river is a MIKE 11 (.sim11) or MIKE HYDRO River (.mhydro) model now fails with "Please select a MIKE1D file".
Google Maps background maps are no longer available in MIKE Workbench or MIKE OPERATIONS Desktop. OpenStreetMap and "No map" remain available, and MapTiler background maps are added as a new option on .NET 10.
Adapter support¶
| Adapter | Status |
|---|---|
| MIKE 11 | Present but not supported anymore (as-is) |
| MIKE FLOOD | Present but not supported anymore (as-is) |
| WEAP | Present but not supported anymore (as-is) |
| GoldSim | Known bug with time series inputs; a patch is planned in a later release |
New features¶
Every new release of MIKE OPERATIONS consists of new modules, new features and/or corrections to problems or significant inconsistencies discovered in previous releases.
Workflow¶
MIKE OPERATIONS 2027 moves its automation engine from Microsoft Workflow Foundation to ELSA workflows (see .NET10 vs .NET472 and Breaking Changes) - see here for how the ELSA Server, its database and the browser-based designer fit together. A new task combines ERA5, GPM and ECMWF rainfall sources into one dataset, with timezone-aware conversion and per-catchment download status. Another new task imports rainfall data directly, as part of a generally improved 1-click import process, and a new task can send email.
The ELSA Server now logs to a file instead of the Windows Event Log. The "Run Scenario" task's Start/End/Forecast times are now optional and the task reports the simulation's final status, its Approve input now works as intended, and it has been renamed to "Run MIKE+ Scenario". The "RunPythonScript" task now logs failures instead of failing silently, and handles script paths containing quotes.
1-click¶
This release improves MIKE OPERATIONS' "1-click" model registration and import tooling. 1-click registration and model run now support MIKE HYDRO Basin models, and 1-click import can now import the default ELSA workflow.
| Module | Title | ID | State |
|---|---|---|---|
| Scenario | MIKE+ model registration uses clearer naming and now includes previously missing log files | 137877, 137878 | Closed |
| Scenario | MIKE+ adapter: Catchment model objects renamed; Global Boundary Condition rainfall now supported as point input | 143800, 143403 | Closed |
| Scenario | Improved MIKE HYDRO Basin simulation performance | 143976 | Closed |
| TS | Time series calculator shows Min/Max values to 6 digits | 144533 | Closed |
| TS | Time series import wizard now has a "Save as" option | 144529 | Closed |
| TS | Time series calculator: checkbox to control whether Min/Max filter values apply | 144531 | Closed |
| TS | Period statistic tool: new property to set the output unit | 144537 | Closed |
| Other | Find Data panel is easier to find | 143921 | Closed |
| Other | Refreshed visual identity for 2027 (splash screens, about dialog, installer images) | 149292 | Closed |
| Other | "MIKE Forecasting Workbench" has been renamed to "MIKE Workflows" (see Breaking Changes) | 149293 | Closed |
Fixed issues¶
MIKE Workbench¶
| Module | Description | ID |
|---|---|---|
| Scenario | Ensemble simulation created more than one output feature class | 129097 |
| Scenario | "Script module not found" error when running 1-click | 143381 |
| Scenario | "Script module not found" error when deleting a model from MFW | 143613 |
| Scenario | MIKE+ registration did not tag input series with a time zone | 146213 |
| Scenario | 1-click registration did not take the scenario name from MIKE+ | 146400 |
| TS | Opening a time series produced a TeeChart error | 142512 |
| TS | Timeseries markers defaulted to on | 142516 |
| TS | Time series import wizard: the property panel scrolled incorrectly | 144528 |
| TS | Time series calculator: saved filter settings did not persist | 144536 |
| Other | A storage name containing certain characters silently prevented a script from running, with no error | 139602 |
| Other | Find Data was case-sensitive | 144210 |
| Other | Find Data panel docked incorrectly after Reset Default Layout | 148721 |
MIKE OPERATIONS Desktop¶
| Description | ID |
|---|---|
| Chart colours did not match the legend | 142763 |
| Chart style dialog did not open | 143705 |
Web APIs¶
| Description | ID |
|---|---|
| Database connection problem when using Web APIs | 142726 |