I started getting this message when I returned to South Africa from Europe on my then 6 week old 6110 navigator. I went into the calendar option to edit my entries to check that all the dates and times were correct, and decided to change the time format from 12 hour to 24hour, i.e. 6pm becomes 18h00. Big mistake! When I tried to then add a meeting, the phone displayed the message "system error" as soon as I completed the entry and returned to the menu. All the stand-by short cuts and calendar entries disappeared off the front screen. I went back into the settings and put the time settings back to the 12 hour format, but the calendar no longer works. All dates apart from the current date that displays at the top of the calendar screen, have disappeared - the calendar shows a blank grid - as have all my entries. Any attempt to add an entry or to scroll to another date just dumps me back at the menu. Each time I move off the front screen into any other application, or switch the phone off and back on, the front screen display and shortcuts disappear and the standby settings have to be re-entered. I took it to the Nokia service centre, as instructed by the help line and my service provider who sold me the phone, and they told me that it would take 10 working days to fix (two weeks in lapsed time!), no loan phone would be provided. Based on the info in this forum, there won’t be a fix! I have tried the option of reloading the software (all 73.1mb), switching off "set time on devices on windows media privacy, trying to sync from Outlook calendar to phone ("system error" again), etc. I am currently trying to delete calendar entries prior to today, and this has been running now for 150 minutes. I can live with the disappearing shortcuts, but is there a technocrat out there with any ideas that may help me to restore the calendar function? Many thanks....