Try this link I had the same issue
http://www.microsoft.com/technet/treeview/default.asp
url=/technet/prodtechnol/office/officexp/reskit/html/olk100
5a.asp
>-----Original Message-----
>i have a strange one, after doing a search in these
>newsgroups i find alot of issues with reminders but none
>that quite match the issue that i am having.
>
>My users are schedule reoccurring reminders and daily
>tasks that used to pop-up and remind them on time... now
>they pop-up anywhere's from 3-24 hours late, or sometimes
>not at all. I have checked the time on the exchange 5.5
>server and everything is in sync.
>
>There must be known issues of this happeneing and a fix?
>
>Any help would be greatly appreciated.
>.
>