Hi Folks, I´m using exchange 2000 / SP2. In Brazil , we´ve "brazilian time summer". The hour grows 1 hour. We´ve GMT -03:000. Example: Normal Hour: 02:00 Summer Hour: 03:00 Official Hour: 03:00 The most machines has the correct time, but some machines has a diferent hour in Outlook->tools->options->calendar options->spindle The hour in spindle is different of hour computer. When you change , or computer hour, or spindle hour, the calendar is changed to wrong state. How can I syncronize this hours ? TKS