Missing emails after change of users Exchange alias (forgot to update POP3 connector)

I changed the Exchange General tab "alias" for several users yesterday and didn't realize til this morning that I forgot to reassign those users to a the new account in the POP3 connector. Now it seems that I have lost the email for these accounts that arrived since I made the change.
Are these emails located somewhere on the server under the old alias? How do I forward the emails to the new alias?
Thanks.

Here is my last question along this line to give you some background.
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/SBS_Small_Business_Server/Q_22151781.html
ArkAdminAsked:
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czcdctCommented:
If you changes the alias then the SMTP address would have changed. Inbound messages to the (newly) "wrong" SMTP address would be bounced back to the sender.
Unless you are journaling your store (unlikely in SBS) and unless you are sending a copy of all mail that is subjected to an NDR (if you don't know that you are then I can tell you that you are not) to an internal address then there isn't a way to locate the messages because they won't be on the system.
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ArkAdminAuthor Commented:
I have both the old and new email addresses listed as valid smtp addresses. Shouldn't the email have been held and routed properly after I assigned the correct account in the POP3 connector?
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czcdctCommented:
That's only half a good sign. Had this been any other POP3 connector you wouldn't have had any problem but the SBS POP3 does it differently. So, the possibility is that you had the POP3 connector send underliverables to a specific mailbox. If you had it do that (if it can) then you're in business.

Otherwise you're fresh out of luck.
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ArkAdminAuthor Commented:
thank you very much
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Windows Server 2003

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