>Dear Sir/Madam
>
>
>Please suggest some LAN Messenger in which one feature should be there
>that all message/Conversation log should be stored in Local + Server Machine
>of the LAN and the application should not run I server is Off.
>
>Please advise

There are some free ones here:
http://www.snapfiles.com/Freeware/network/fwnetworkmessage.html

FYI - I suggest trying to find one that doesn't use the Windows Messenger Service because a lot of people turn that off.