Troubleshooting Public Folders migration
When configuring the connection to a target server, the connection wizard checks if the provided admin account is assigned the Public Folders role. If the role is missing, you receive a warning message. The text of the warning message, as well as the steps needed to troubleshoot the problem, differ depending on the target Exchange Server used.
The Public Folders role is only required when you’re migrating public folders. If you only plan to migrate mailboxes, you can ignore this warning.
The following warning message is shown during the Configuration step of the Target server connection wizard (Fig. 1.):
Role ‘Public Folders’ is not assigned to admin account
If the program is unable to check the roles assigned to the admin account, it means that the used account does not have the View-Only Configuration role assigned (learn more).
The program will attempt to assign this role automatically (Fig. 2.), as well as other missing roles. Click Yes to proceed.
If the program is unable to assign the missing roles, it means that the provided account doesn't have appropriate rights to do so. You will be asked to enter credentials of an admin account that is a member of the Organization Management role group (Fig. 3.). If you are certain that this account belongs to that group, make sure that you typed the credentials correctly.
Enter the UPN manually or click Browse to choose another account from the same domain. Provide a valid password and click OK. The missing roles will be assigned and the Configuration step will finish successfully.
Note that only the credentials specified in the Admin account step are used to connect to the source or target server. Credentials provided in the Configuration step are only used once to assign the missing roles. Therefore, you will not be asked to provide the credentials of other admin users again as long as you use the same admin account for the migration process.
If you don't want the program to assign any roles automatically, you can do it manually, following the steps described in this KB article.
The following warning message is shown during the Configuration step of the Target server connection wizard (Fig. 4.):
Check Public Folders access rights
Assigning the Public Folders role to the admin account is not enough to migrate public folders to the target Exchange Server 2010. You also need to manually grant the admin account the Owner access right to the public folders located on the target server. Refer to this KB article to learn how to do it.