Originally Posted by ppittman
Having the same issue on 4.1.7 and Exchange 2003. According to O2, it is because this year there are 5 Sundays in October.
most causes are from incorrect CDO version on BES or exchagne has not been updated for the new DST rules. also the device OS can cause issues if not up to date.
there are 5 Fridays, Saturdays and Sundays this month.
neat info here too This October Has 5 Fridays, Saturdays, & Sundays, But That Happens Way More Often Than
Please state your times zone since there are some issues with certain ones.
you can search DST and your time zone here too BlackBerry Technical Solution Center