outlook integration causes problem in outlook

I have a customer who uses SAP 8.8 with MS outlook 10. Which causes some issue with outlook?

When you logoff SAP it does not shutdown one of the integration services (BO_Sync Exe) and when that happens you cannot open outlook it gives you error msg as soon as you stop that process and logoff from windows and log back on outlook work again.

I tested on some stations on most of them as soon as you logoff from SAP all outlook integration process shuts down but on couple of them it does not and it causes a problem with outlook.

Is there any setup issue? Or it's a MS outlook 10 is not compatible with SAP 8.8

Tkx

Shawn