Migrating from an Exchange 2010 on Windows Server 2008 to Zimbra 8.

I have a workstation that is logged as Domain Admin and I am able to migrate some email accounts, but on other email accounts I receive the below error. These accounts have the same domain settings. The email accounts are there and verified. It doesn't seem to be linked by size of the account.

[2013-05-29 15:36:44.360145] info Init host=host location=jcoombs account=jcoombs
[2013-05-29 15:36:44.369144] err ErrCode:x80005010 Description:Util::GetUserDNAndLegacyName(): S_ADS_NOMORE_ROWS SrcFile:MapiUtils.cpp SrcLine:403
[2013-05-29 15:36:44.370144] info Account name jcoombs
[2013-05-29 15:36:44.370144] info Account Id jcoombs
[2013-05-29 15:36:44.370144] info Account Num 0
[2013-05-29 15:36:44.370144] err Unable to initialize jcoombs Please check the admin credentials for permissions/rights to query the directory or verify if source mailbox exists.
[2013-05-29 15:36:44.372144] info schdeulviewmodel- GetThreadNum
[2013-05-29 15:36:44.372144] info in DOWORK -- Migration failed for usernum: 0 and threadnum0
[2013-05-29 15:36:44.375143] info in worker_RunWorkerCompleted -- Migration completed
[2013-05-29 15:36:44.375143] info in worker_RunWorkerCompleted -- Migration completed lets cehck overflow count and it is 0
[2013-05-29 15:36:44.375143] info in worker_RunWorkerCompleted -- Migration completed overflowcount is zero
[2013-05-29 15:36:44.375143] info in worker_RunWorkerCompleted -- Migration completed