Using zcs 5.0.5 Open Source Edition.

I want a system for zimbra to share a common address book for all zimbra connected clients through outlook or zimbra desktop.

Suppose,I have 100 users list in my zimbra account & I want to add 50 more users mail address & other info. in zimbra , so that all the zimbra users will get the address book with the newly added 50 names.

I am asking this,because my most of the clients are based on outlook & I don't want to add new created mail id's separately on all PC's.

Is there any way to do that?

Then,after i the creation of 50 mail id's,when the existing users tried to login into their system, a pop up will appear,showing new employees mail id list & their information.

This type of structure is possible? If yes,then How?