You may experience a problem where the Migration Manager for Exchange agents (Mail Source Agent, Mail Target Agent, Calendar Synchronization agent, etc) are unable to log on to the Microsoft System Attendant mailbox.
"11/9/2007 11:27:19 AM CSession::Logon TraceMsg 4800 Logging on to the mailbox /o=ORG/ou=First Administrative Group/cn=Configuration/cn=Servers/cn=SERVER/cn=Microsoft System Attendant (Server: SERVER, user: domain\account).
11/9/2007 11:27:19 AM CSession::Logon Error -2147221219 The attempt to log on to the Microsoft Exchange Server computer has failed. - MAPI_E_FAILONEPROVIDER (Microsoft Exchange Server Information Store) Low level error: 0x0 File: aeWrapHelpers.h Line: 264"
or
"11/9/2007 11:27:19 AM CSession::Logon Error -2147221219 The attempt to log on to the Microsoft Exchange Server computer has failed. - MAPI_E_LOGON_FAILED (Microsoft Exchange Server Information Store) Low level error: 0x0 File: aeWrapHelpers.h Line: 257"
and similar errors.
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