Three probable causes, but only two you can address. First, make sure your Windows time zone is set correctly. Control Panel>Clock, Language, and Region>Change the time zone. Second make sure your Outlook Calendar time zone is set correctly. File>Options>Calendar>Time
The other probable cause is that the mail server doesn't have the same time zone selected as you do. You can't change that, but you can verify it by examining the message headers. Open the message and click File>Properties. Trace the Received headers
to see where the time discrepancy originates. If it's a server, you should be able to find it there, but you won't be able to affect it unless you control the server.
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