Microsoft will release an update on March 10 that prevents Sophos Enterprise Console (SEC) versions 5.5.1, and 5.5.2 if downloaded before March 5, from opening. This does not affect protection capabilities. Endpoints and servers will continue to receive updates. No other products or services are affected.

To address this, please advise customers to upgrade to the latest version of SEC 5.5.2, which fixes the issue. Alternatively, customers can resolve the problem by downloading and installing a replacement resource DLL in their SEC 5.5.1 installation. For full details on the process please refer to this knowledge base article: https://community.sophos.com/kb/en-us/135238

Affected customers will be notified separately with the instructions contained in this post. If you have any questions, please reach out to your Sophos representative.