MAGE uses different flags to perform MAPI logon in cases when Public Folder database(s) exist in the Exchange organization and when no Public Folder database(s) are present.
If private mailbox database has no Public Folder database associated to it, MAGE uses connection flag aeCONNECT_IGNORE_NO_PF. In this case msExchHomePublicMDB attribute value of the private mailbox database is <not set>.
If private mailbox has got an associated Public Folder database, it uses connection flag aeCONNECT_EMPTY. In this case msExchHomePublicMDB attribute value of the private mailbox database is set to the DN on the associated Public Folder database.
This flag can be seen in the log trace showing logon:
MAPI logging on to the mailbox : /o=[source_organization]/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=test.user (server : [source_server_name], user: [service_account], connection flags: aeCONNECT_EMPTY)
If Public Folder database doesn't exist in the Exchange organization, but the msExchHomePublicMDB attribute value of the private mailbox database is populated, the MAGE uses aeCONNECT_EMPTY flag when logging on, but fails because no Public Folder database actually exists.
To resolve the issue, clear msExchHomePublicMDB attribute of the mailbox database and resynchronize the problem mailbox.
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