In response to Egypt’s government announcement regarding the summer Daylight saving that will start on 15th of May 2014 by adding 1 hour Except for the holy month of Ramadan, Microsoft has released a Fix to automatically adjust the computer’s clocks.
The daylight saving time start on midnight of May 15th at exactly 11:59:59 PM, without applying the fix your users will face problems with Active Directory and Exchange Servers besides having their calendars off by one hour.
to avoid this you need to apply the fix provided by Microsoft http://support.microsoft.com/kb/2967990 using Microsoft SCCM or a Startup group Policy.
Make Sure that you have the latest Windows Cumulative Update for your time zone and DST installed before running this fix-it solution. To find the latest update: http://support.microsoft.com/kb/2904266
Please note that All Microsoft Outlook calendar entries for meetings and appointments between the 15th of May and 27th of June, 2014 will be shifted by 1 hour. This will happen because the previous DST settings were in place during adding these calendar
entries (previous DST settings are currently inapplicable). It is recommended that you recheck all calendar entries for the above mentioned period.
Good Luck Egypt’s Administrators 🙂