Dear Dil,

You should create a mailbox for all named users.
It is advised to create a mailbox also for concurrent users, to use all the system possibilities (e.g. mailing), but it is not mandatory. Usually you are evaluating, which concurrent users require one and which - don't.

Best regards,
Eberstein Business Solutions
HansaWorld Business Partner
----------------------------
Exceeding Customer Expectations
www.ebersteins.com
support@eberstein.lt