After the recent updates by Microsoft for Office 2010, the NIS integration with Outlook 2010 does not work.
I tried the solutions I have seen like disabling it in the Settings then Network then Message Protection Client Integration and restarting and then enabling it.
That does not work. I check the SERVICES and it seems to be fine.
I have two computers and on one I do not have this problem with NIS integration. the one with the problem is Win64 bits.