When Microsoft Forefront Protection 2010 for SharePoint is no longer going to support a scan engine, an announcement is written to the event log to publicize the date on which updates for this engine will no longer be available. Notifications, which include links to information about this engine's deprecation, are written to the event log on a weekly basis up until one month before the date on which the engine becomes obsolete. After that time, event log notifications are written on a daily basis.
Upon receiving a notification about an engine being deprecated, it is strongly recommended that you disable the use of this engine with any scan jobs. Once the engine becomes obsolete, the definitions on disk will become out of date and the scanning usefulness of this engine diminishes.
After the date on which the engine becomes obsolete, updates are no longer available for this engine. If the obsolete engine is still enabled for updates, update checks for that engine are automatically disabled, and an error notification is written to the event log. If the obsolete engine is in use with a scan job, an error notification is written to the event log on a daily basis until the engine is disabled for that scan job.