Microsoft Database Daemon allows reminders in Microsoft applications to function even if no relevant applications are running. Microsoft Office for Mac 2004 and 2008, as well as Entourage, use this feature.
Daemons are networking programs that automate routine maintenance tasks without any input or impetus from the user. Daemons run in the background and activate only when necessary, which is determined by the applications they monitor.
Microsoft Daemon Startup
If notifications are enabled in Microsoft Office, the database daemon will be present in the start-up items list, which can be checked by navigating with a mouse to the Startup directory in Program Files, found under the Start menu. There should only be one instance of the database daemon. You can safely delete any superfluous start-up links by right-clicking and selecting delete.
To quit the daemon application, open Activity Monitor in your Utilities folder, open Microsoft Reminders and double-click to open and select quit.