Hi my Question... When I create new mailbox, it's not immediately visible from external network. After two days I see email in global address and can be seen fron external network. Why?? Before it wasn't so. THANKs

What is your Exchange server version ? and do you mean by External network the Internet Users or users from other AD sites? Dawy

1 - exchange 2007 2 - Other AD site, internet etc...

Check the replication, and events for OAB . If they are not visible in other AD sites indicates replication is slow. Can you create a user , check in the DC in the same site and initiate replication to see if it is seen on other sites. You can Connect to other server from ADUC. Check windows replication events , OAB events and configure diagnostic logging as applicable