I have found the following problems with DS and Symbian devices, although some problems may not be Symbian specific.

I'm running:
Groupwise server 8.0.2 (Final)
Groupwise client for Windows 8.0.2 (Final)
Novell Datasynchronizer build 81 (14-07-2010)

Problem 1: The Nokia E72 (latest firmware) doesn't synchronize with build 81. This worked well with previous versions. I am therefore now synchronizing this device with an older version. (I'm running 2 different versions of DS)

Problem 2:
An appointment isn't being deleted on the Groupwise server when doing the following: Adding a normal appointment through the Groupwise client, syncing the device, deleting the appointment on the device, syncing the device again.
I have tested this with a Nokia N97 mini (MfE 2.09.208) and Nokia 6720 (MfE 3.0.050).

Problem 3:
An appointment alarm is not disabled on the device when doing the following: Creating a new posted appointment (and posting it) through Groupwise client, deleting the alarm through Groupwise client, synchronizing the device.
The deletion of an alarm flag isn't being synchronized to the device.
I have tested this with a Nokia N97 mini (MfE 2.09.208) and Nokia 6720 (MfE 3.0.050).

Kinds regards, Don