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If they are configured to use encrypted remote procedure calls (RPCs), Outlook 2003 SP2 clients can connect to Exchange 2010. However, the elimination of User Datagram Protocol (UDP) support in Exchange 2010 causes a problem for Outlook 2003. Outlook 2003 depends on UDP packets for new mail notifications and to update folders in user

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mailboxes. UDP notifications were an appropriate mechanism for this work when clients had to connect over a corporate network (or with a virtual private network [VPN]) to access mailboxes, but they are less useful as connectivity has moved toward a model where pervasive access across the Internet becomes the preferred model. Outlook 2003 supports a polling mechanism as a backup when UDP is not supported. The polling mechanism was provided to support the first Outlook clients that connected to Exchange 2003 servers using RPC over HTTP, but it does lead to a delay of up to one minute before the UDP notification fails and polling delivers notification that a new message has arrived. The problem is less noticeable when Outlook works in cached Exchange mode because of the asynchronous nature of operations, but it still exists. Thus, although you can connect Outlook 2003 SP2 clients to Exchange 2010, users might notice that notifications aren t as snappy as they were before. In order of attractiveness, the available options to address the issue are as follows:

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1. Upgrade clients to Outlook 2007 or greater to remove UDP from the equation. 2. Reconfigure Outlook 2003 clients that work in online mode to work in cached

Exchange mode (this is always recommended; there are many other advantages to be gained when clients are deployed in cached Exchange mode).

clients poll every 60 seconds. You can reduce this interval to 10 seconds (Outlook ignores smaller intervals) by updating the system registry on Client Access Server (CAS) servers as described in http://technet.microsoft.com/en-us/library /aa996515(EXCHG.80).aspx. A reduced polling interval inevitably generates some increased load on the server, so this is not something to do on a whim. There are other issues with Outlook 2003 that make this client a less than optimum client for Exchange 2010. The Exchange development group has described the most important issues that affect Outlook 2003 when it connects to Exchange 2010 at http://msexchangeteam.com/archive/2010/04/23/454711.aspx. The fact that such a long list of potential problems exists does not make Outlook 2003 bad software, because it was an excellent client when Microsoft first released it in 2003. However, the degree of change that has taken place since in databases, connectivity, and environments has made it difficult for Outlook 2003 to remain as usable as it once was, and it s probably time to refocus efforts on upgrading to a newer client in conjunction with Exchange 2010 deployments.

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The UDP problem or the list of features only available to Outlook 2010 clients is not mission critical, nor is it sufficient to justify an upgrade for thousands of desktops to Outlook 2010 . On the other hand, this list does underscore the close development relationship between client and server and the fact that if you want to achieve maximum functionality from a server, you need to deploy a client that understands how to exploit all of the functionality that the server can offer .

As we ve just discussed, Outlook began to transition from using UDP notifications after the introduction of RPC over HTTP Outlook 2007 and Outlook 2010 use asynchronous RPC notifications because these notifications work through firewalls, whereas UDP usually does not Notifications tell Outlook that a change has occurred, such as the arrival of a new message in the mailbox on the server to which it is connected Outlook still has to fetch details of the change to be able to display it to the user, but processing might be inefficient if Outlook leapt into action immediately The nature of email is that several changes might occur rapidly at times of peak demand For example, morning sessions are often marked by flurries of email as users come into work and process their Inboxes before setting out to address the other challenges of the day.

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