Migration Manager for Exchange 8.15 - Source Exchange 2007 Environment Preparation

Configuring the NSPI Connection Limit

By default, the maximum number of simultaneous Name Service Provider Interface (NSPI) connections equals to 50 per user for Windows Server 2008 or later domain controllers. Therefore, to avoid possible issues related to exceeding that value, you may need to increase the NSPI connection limit on all Windows Server 2008 or later domain controllers acting as Global Catalog. The recommended limit value equals the number of agent instances working simultaneously multiplied by 5.

To change the default connection limit for a domain controller, take the following steps:

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NTDS
3. Click the Parameters key.
4. On the Edit menu, point to New, and then click DWORD Value.
5. Type NSPI max sessions per user, and then press Enter.
6. Double-click NSPI max sessions per user, type the appropriate maximum number of the NSPI connections, and then click OK.

7. Restart the computer or restart Active Directory Domain Services.

For additional information, see the following Microsoft Support articles:

• Error: "Trying to connect to Microsoft Exchange Server" results in MAPI_E_LOGON_FAILED
• NSPI connection to a Windows-based domain controller causes MAPI client applications to fail and returns a "MAPI_E_LOGON_FAILED" error message

Setting Up Connection with the Target Exchange Organization Using SMTP Connectors

This section describes how to set up a connection with the target Exchange organization using SMTP connectors. On this step you may need to coordinate with the administrator of the target Exchange organization to set up the connection properly.

For more details, see the related topics:

• Setting up Source Exchange Organization for Internet Mail Flow between Source and Target Exchange Organizations
• Configuring Source DNS Server for Mail Forwarding
• Testing the SMTP Connectors (Optional)

Setting up Source Exchange Organization for Internet Mail Flow between Source and Target Exchange Organizations

You need to establish Internet mail flow between the source and the target Exchange organizations. For that, one of the following methods can be used:

• Establishing Internet mail flow directly through a Hub Transport server.
• Establishing Internet mail flow through a subscribed Edge Transport server.

Establishing Internet Mail Flow Directly Through a Hub Transport Server

If you choose this option, you need to create an Internet Send connector and Receive connector on an Exchange 2007 Hub Transport server that can be directly reached through the Internet.

To establish mail flow to and from the Internet through a Hub Transport server, follow these steps:

1. Create a Send connector (to send email from source (target) Exchange 2007 organization to the Internet) on the Hub Transport server.
2. Modify the default Receive connector for the source (target) domain to accept anonymous e-mail from the Internet
3. Add the e-mail domain used for redirection to the list of accepted domains on the Hub Transport server.

Each step is explained in further detail in the related subtopics.