MicroCalendar - Windows Tray Calendar - Version 1.3.2.9 MicroCalendar is a Windows system tray popup calendar. It is small, unobtrusive, and always ready so you can easily check calendar dates without messing up your computer's system time or having to use a resource-intensive application. Features an attractive user interface, a tray icon that shows today's date, displayable week numbers, copy-date-to-clipboard, and form persistence (remembers where you put it last on your screen).