Actually, only recurring meetings are stamped with a time zone. Single Instance meeting aren't. That's why the tool needs to be run. BTW and that's only Exchange 2003 and earlier, Exchange 2007 DOES stamp every meeting with time zone information. The tool basically moves all single instance meetings one hour during that 3 week period when the computer wouldn't have known that DST started. These are for previously scheduled meetings. One thing to keep in mind, if you patch the workstation OS, you want to run the calendar tool ASAP. As soon as you patch the OS, the computer till know about DST and schedule the meetings correctly. When you then run the tool on these correctly scheduled meetings, it will still move them by an hour. Greg ----- Original Message ----- From: Periyasamy, Raj To: exchangelist@xxxxxxxxxxxxx Sent: Thursday, February 08, 2007 2:00 PM Subject: [ExchangeList] Re: How to address daylight saving time by using the Exchange Calendar Update Tool Per the article, yes, you have to. But if you read the article that says how Outlook stamps Calendar time, it makes it a little confusing as to why we need to run this tool. All calendar items are stamped with GMT. Then, based on the client Time zone settings, the Calendar item's time should be converted to the local time. So if the client and server are patched, it should be sufficient to convert the GMT stamps into local time. I am trying to research more into this. http://support.microsoft.com/kb/195900/en-us HTH. Regards, Raj Periyasamy MCSE(Messaging), CCNA ------------------------------------------------------------------------------ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Ara Avvali Sent: Thursday, February 08, 2007 1:38 PM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: How to address daylight saving time by using the Exchange Calendar Update Tool Is it necessary doing this if both server and clients are fully patched with wsus? From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Michael B. Smith Sent: Thursday, February 08, 2007 5:36 AM To: exchange-2003@xxxxxxxxxxxxxxx; exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] How to address daylight saving time by using the Exchange Calendar Update Tool It's live: How to address daylight saving time by using the Exchange Calendar Update Tool http://support.microsoft.com/default.aspx?scid=kb;en-us;930879 And the tool: Exchange Calendar Update Tool http://www.microsoft.com/downloads/details.aspx?FamilyId=A9336886-4B28-4010-9416-36D38429438D&displaylang=en