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You can remove the SID, if it is not resolving to any user. It will not going to impact migration process. 
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You can remove the SID, if it is not resolving to any user. It will not going to impact migration process.

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Thank you for your reply, we are going through the steps right now. &nbsp;Will let you know how it goes. 
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Thank you for your reply, we are going through the steps right now.  Will let you know how it goes.

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After explicitly adding my domain account to the local admin group and redoing the wizard, it worked! &nbsp;Thank you for your help.
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After explicitly adding my domain account to the local admin group and redoing the wizard, it worked!  Thank you for your help.

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We have an AD 2003 / Exchange 2003 Forest we would like to migrate to AD 2008 / Exchange 2010.<br />
<br />
From reading kb articles, we need to have the Exchange Full Administrator Role to migrate mailboxes accross forrests. &nbsp;We would like to put both forrest domain admin groups in this role if possible, but there is only a SID that shows up when we run the Exchange Administration Delegation Wizard in the source 2003 domain. &nbsp;Unfortunately, we have searched through the 2003 AD and can not match that SID with an active user or group. &nbsp;ADSI Edit did not help either. &nbsp;Would this somehow hinder our process once we get started the migration? &nbsp;We have about 250 mailboxes to migrate accross the forrests. <br />
<br />
Any help and advice is greatly appreciated.<br />
<br />

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We have an AD 2003 / Exchange 2003 Forest we would like to migrate to AD 2008 / Exchange 2010.

From reading kb articles, we need to have the Exchange Full Administrator Role to migrate mailboxes accross forrests.  We would like to put both forrest domain admin groups in this role if possible, but there is only a SID that shows up when we run the Exchange Administration Delegation Wizard in the source 2003 domain.  Unfortunately, we have searched through the 2003 AD and can not match that SID with an active user or group.  ADSI Edit did not help either.  Would this somehow hinder our process once we get started the migration?  We have about 250 mailboxes to migrate accross the forrests. 

Any help and advice is greatly appreciated.



Exchange Full Administrator Role - Old SID - Mailbox Migration

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.