On April 19, 2024, HCL announced Extended Support for HCL Domino and Notes v9.0.x and v10.0.x through June 2, 2025. We have now moved the end date one more year to June 2, 2026, to allow our customers even more time to upgrade to a supported product version.

• For any customers who have already signed up for Extended Support through June 2, 2025, if they wish, they may get a quote for the additional year of Extended Support through June 2, 20260
• Extended Support is for usage and known defect support only. Support is limited to technical assistance and existing fixes to known problems.
• Existing fixes to known problems will be provided. However, no new defect fixes will be provided.
• The Domino and Notes v9.0.x and 10.0.x Extended Support Scope is detailed at this link in the April 19, 2024 Knowledge Article.
• The coverage limitations can be found at Domino v9.0.x and v10.0.x List of Exceptions

Nevertheless you’re missing a bunch of great features which came in V11 up to V14 ( and soon V14.5 ) !!!