Offline
Address Book (OAB) consists of collection of address lists that is
downloaded by the offline clients when they are not connected with the
server. Microsoft Exchange Server generates the OAB file, compress it
and place it on the local share. Administrator can distribute this file
in two ways:-
1. Web-based distribution
2. Public folder distribution
In Web-based distribution, the Client Access Server
replicates the files by using HTTPs and BITS. Web-based distribution
method support more concurrent users and reduce bandwidth usage.
We can move OABs in the following configurations:-
· Between Exchange Server 2010 servers
· From Exchange Server 2010 to Exchange Server 2007 servers
· From Exchange Server 2007 to Exchange Server 2010 servers
· From Exchange Server 2003 to Exchange Server 2010 servers.
Note: OAB cannot be moved from Exchange Server 2010 to Exchange Server 2003 servers.
Types of OAB versions
There are different OAB versions and each version supports below Outlook clients:-
· OAB version 4 (Unicode OAB):- Clients receives differential OAB rather than full OAB.
o Outlook 2003 (SP2)
o Outlook 2007
o Outlook 2010
· OAB version 3 (Unicode OAB):- Help clients to send few servers RPC and sort rules for different language locales.
o Outlook 2003
o Outlook 2007
o Outlook 2010
· OAB version 2 (ANSI OAB)
o Outlook 98
o Outlook 2000
o Outlook 2002
o Outlook 2003
o Outlook 2007
o Outlook 2010
All Client Access servers download OAB and download
time depends upon the poll interval (the default is 8 hours). The first
poll occurs when the Microsoft Exchange File Distribution service
starts. Two different Client Access servers may not download the same differential file at the same time, unless they were started at the same time. It may take minutes and hours to download
the OAB file depending upon its size and network link. The size of OAB
may vary depending upon the number of certificate in a company, and
number of recipient and distribution groups in Active Directory.
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