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I have a call raised for this and as soon as I get a fix I will let everyone know

They are not updating to the daylight saving time as they should. If you run

w32tm /tz the output is

C:\>w32tm /tz
Time zone: Current:TIME_ZONE_ID_STANDARD Bias: -120min (UTC=LocalTime+Bias)
[Standard Name:"Egypt Standard Time" Bias:0min Date:(M:9 D:5 DoW:3)]
[Daylight Name:"Egypt Daylight Time" Bias:-60min Date:(M:5 D:1 DoW:5)]

I have one DC that is in Egypt that has the correct time and the output from that is

C:\Documents and Settings\gioes-admn-0002>w32tm /tz
Time zone: Current:TIME_ZONE_ID_DAYLIGHT Bias: -120min (UTC=LocalTime+Bias)
[Standard Name:"Egypt Standard Time" Bias:0min Date:(M:9 D:5 DoW:3)]
[Daylight Name:"Egypt Daylight Time" Bias:-60min Date:(M:4 D:5 DoW:5)]

XP clients that are connecting to this server are synching time but because they do not think they are in daylight saving they are 1 hr behind. I tested a synch on a XP client by moving it forward by one hour to the correct time and then carried out a w32tm /resync and it moved it back one hour. So the clients and some DC's are not picking up that it has moved into Daylight saving. There is an issue with the time zone information that is held on the clients rather than the time synch process.