Daylight Savings issue

Hi,

Could someone please help with the below problem?

We had applied the DST patch in march 2008 to client OS(win xp pro) and all servers os.However,we missed out on the part to run tzedit or exchange tool for Outlook.After we realised the problem with Outlook appointments being out for one hour in early april 2008 we had to do the the exchange update tool.Which we did somewhere in may and all appointments were looking fine.But I have recently noticed that Outlook appointments are out again.Please share your thoughts?

Thanks,

Ash