I had a lightning strike about 60 feet from my office years ago.  I had the individual module open in Lacerte.  It fried ALL the client names/ssn's/dependent info for the my entire data base.  As well as the printer port on my HP printer.  All of this despite UPS battery backups.  

Support was spectacular in trying to help, but to no avail.  Thank GOD for good/recent backups.  And thank god it didn't actually hit the building.