Official HOWTO (grep "recent MS") says: "There are reports that recent MS Windows clients do not like to work with share mode security servers." It is not said which MS Windows clients are recent and which are not.
I have removed this comment as I have not been able to reproduce any problems that have been mentioned since August 2003. All reports of difficulties were caused by misconfiguration. - JHT
sorry for the same, cleaning up the database to prevent unecessary reopens of bugs.