We works with exchange 2003 and office 2007 sp3 on windows 7 64 bit.
We notice that all the reminders that was create on task manager are'nt pop up on the remindier window.
I notice that when I configure the outlook profile with cache mode it work OK , all the reminder pop up,
when I turn it off again the reminder stop pop up.
Because we are working with terminal and roaming profile , the chach mode is off on all users.
I try already done the following option:
1] Click on File -> Options -> Advanced
In 'Reminders' section check to see if 'Show reminders' is checked.
 Start Outlook with '/cleanreminders' command
(Start -> Run -> outlook /cleanreminders)
 Start Outlook with '/cleanfreebusy' command
(Start -> Run -> outlook /cleanfreebusy)
 A corrupted reminder
Now you'll see why this may be the solution you will like if you have many of them :-(
Open Calendar, click on View -> Current View -> Recurring appointments.
Opened each one of them until you get the error "Recurrence data not found".
Delete this one and you should be all good to go.
However, I am not familiar with detailed Outlook configuration. So I would recommend that you repost you issue at Office Forum. There you may get more effective suggestion by other experts who familiar with this topic. Your understanding is highly appreciated.
Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.