We have a windows environment (W2K3R2)
GW703
GMS204
Nokia phones (E90-E61)

We notice that after a period, without any reason why, some users het all their items double, or even multiplied. (mail-calendar-sent items- etc.)
After removign the user, reset the device, it works again, but after a while it starts again. It is a lot of work and try to explain it to the user

Can anybody tell me what is wrong, what to do. or how to solve it ones and for all....

Grtz