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If you create a recurring event before DST starts and let it reoccur while DST started, the time is one hour off in webmail calendar and webmail today page.
DST started at 29 March 2015, so you can reproduce it by creating an event starting on 28 March (or earlier) and repeat it every week. After 29 March it will be shown an hour later.
Everything seems fine in Android, iOS or Outlook, it only displayed wrong in the webmail client itself.