We have a customer with SBS 2003. They have reported today that all calendar appointments prior to 25th October 2008 have disappeared from all users calendars. Checking back the server has not reported any errors around this time.
The company does a backup of Exchange once a year as a secondary precaution to keep copies of their diaries, the last one being in February 2009 all of the missing items are contained within this backup, so restoring isn't an issue.
My question is how has this occured, 25th October is when the clocks change in the UK, could this be something to do with it??