Users in the Miami office do not receive new mail notifications while logged into the Exchange server unless they click on a folder or send a mail message. The headquarters is located in Dallas and none of the users at HQ experience this problem. The offices are connected via a 128K link using two Cisco routers which only filter UDP packets.
All necessary ports appear to be open on the routers.
The Miami office has 52 users, there are 104 in the Dallas office. Desktop support has tried reinstalling Office and Outlook, but all users are still experiencing the problem. The Dallas office is on the 139.146.210 segment, the Miami office is on the 139.146.34 segment. One user at the Miami office was configured to use POP3 and his machine connected every five minutes and downloaded new mail without a problem. When the Miami users dial into the network via the Dallas RAS server, open Outlook online and stay connected they receive the new mail notification message, without having to click on a folder.