Exchange 2007 Multi Node Single Copy Cluster and Additional MTA Issue

Based on my experience , there is no need for addinational MTA on Exchange 2003 Multi Node Cluster. If you have an MTA resource on first Exchange 2003 node, you don’t need additional MTA resource at other Exchange Nodes.

But If you install multi-node single copy Exchange 2007 Cluster, you have to create additional MTA in Active Directory (by using AdsiEdit) for every additional Exchange 2007 nodes. If you don’t do that you cannot create a mailbox on these Exchange nodes.

You receive the following error in Exchange Management Console: “A proxy generator DLL on server FQDN.serverName could not be found or failed to initialize. Proxy addresses for the current recipient cannot be calculated. Please ensure that all proxy address generator DLLs have been installed on the target server”

Additionally, the following event may be logged:
Event Type: Error Event Source: MSExchangeIS Event Category: General Event ID: 1201 Description: Error -2147221233 reading/decrypting the msExchResponsibleMTAServer attribute on the Server object in the Active Directory. For more information, see Help and Support Center at Data: 0000: 5b 44 49 41 47 5f 43 54 [DIAG_CT 0008: 58 5d 00 00 26 00 00 00 X]..&... 0010: ff f0 0d 00 00 00 00 00 ÿð...... 0018: 00 02 18 00 00 00 cd 4a ......ÍJ 0020: 20 10 00 00 00 00 bd 5f .....½_ 0028: 20 10 00 00 00 00 bd 5f .....½_ 0030: 20 10 00 00 00 00 .....

Move Mailbox operations doesn’t care about additional MTA on every Exchange2007 Server on cluster. You can successfully move mailboxes to these Exchange servers. But these clients cannot logon via Outlook Web Access or MAPI (Outlook).

You can find additional information at http://support.microsoft.com/kb/928811 Microsoft support article.