Can I still use the Classic UI and WebForms after they become deprecated?
Customers are advised to upgrade to the most recent version. If your project is running on a version where the listed capability is still supported, you may continue to use it, however we recommend switching to an alternative option as soon as possible. As of Sitefinity 14.1, Progress will not invest in feature development or bug fixes.
Will I be able to get any support should I run into an issue with any of the features that are being deprecated?
No further feature development and no bug fixes will be provided. In terms of related technical support, we will provide best-effort support, which means that the availability of knowledge and skills to diagnose and resolve technical issues is not guaranteed.
Any security issues will be treated with the appropriate attention, as usual.
Will we be forced to upgrade/stop using the features that are being deprecated?
An upgrade to the latest version provides access to a host of improvements, bug fixes and new features. However, customers will not be forced to upgrade their Sitefinity projects. Please refer to Sitefinity's life cycle policy guide for information on your specific version’s support and product updates availability.