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Exchange 2010 to 2013 action cannot be completed the name cannot be matched to an address book

I'm having issues in a migration environment. I am moving mailboxes from 2010 to 2013 and I'm having issues reaching outlook externally. I have rpc over http all setup and the mailbox passes all checks on testconnectivity.com. But when I am external from the network I get the error "The action cannot be completed. The name cannot be matched to a name in the address list. I verified there are no weird MDB entries in ADSI edit so I'm not sure why this is an issue.
ExchangeOutlookEmail ServersEmail Clients

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8/22/2022 - Mon
Jason Crawford

Open EMS and try this:

Get-Mailbox <mailbox alias> | fl HiddenFromAddressListsEnabled

Open in new window

If it returns True you found the culprit.

It returns false,  thats one of the things Ive been looking at.
Jason Crawford

Only thing I'm coming up with is make sure any lingering .ost files on the computer you're working on have been deleted and use ADSI Edit to check the shownInAddressLists attribute.  Other than being hidden that's all I've ever encountered...at least that I can remember.
Your help has saved me hundreds of hours of internet surfing.

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I was able to resolve this on my own