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If the country or region where your organization or some of your users reside has changed their policy of recognizing daylight saving time (DST), or changed the local time offset from Coordinated Universal Time (UTC), you need may need to update Windows, Exchange, Outlook, or other programs to accommodate these changes.
Even if your time zone hasn't changed, if you interact with other computers or users globally, your computer needs to be able to do accurate date and time calculations for events elsewhere in the world.
Installing the time zone updates as soon as possible minimizes the number of Outlook and Exchange meetings or calendar events that are scheduled during the transition from the old to the new time and dates.
Make sure all client and desktop computers have installed the Windows DST update. For more information, see How to configure daylight saving time for Microsoft Windows operating systems. Also see the Windows Cumulative update.
Because the Office 365 authentication system will be updated, all Office 365 client computers need to be updated or they may experience connectivity issues.
Update all of your on-premises servers with the Windows DST update. If you are running Office 365, any servers that interact with the Office 365 authentication system, such as DirSync or AD FS servers, must be updated to ensure uptime.
If you are updating server clusters, make sure you follow the usual process for updating clusters. You update the passive server first, fail over to the passive server (which becomes active), and then update the formerly active (now passive) server. For more information on updating server clusters and high-availability server clusters, see Updating cluster and high-availability servers.
Install the latest DST update on your Exchange servers. For more information, see CDO time zone tables.
If you are updating server clusters, again make sure you follow the usual process for updating clusters. See Updating cluster and high-availability servers.
Step 4: Update Exchange and/or Outlook on all client and desktop computers
Check whether and which of your users need to run the Exchange or Outlook time zone tools, and which tool to run.
This table shows when users should run the Exchange Calendar Tool or the Time Zone Data Update Tool for Microsoft Office Outlook. Find which version your organization’s servers are running, and then read across to what client programs your users are running.
Exchange 2003 on premises
Exchange Calendar Tool
Time Zone Data Update Tool for Microsoft Office Outlook
No action required
Exchange 2007 on premises
Exchange 2010 on premises
Time Zone Data Update Tool for Microsoft Office Outlook)
BPOS-S (Exchange 2007)
BPOS-D (Exchange 2010)
O365 (Exchange 2010)
See the Microsoft Daylight Saving Time Help and Support Center for information and links to updates, and other DST changes around the world. You should also visit the support websites of your other software suppliers to see if they require any additional updates.
I installed O365 and office 2010plus. (last option in the table above) However when I check into my acces2010 database on sharepoint i receive a sharepoint message that the timezone of sharepoint is not corresponding with the time zone of my local computer. I don't know which, but action is required I guess.