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GaryJones-5152 avatar image
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GaryJones-5152 asked KyleXu-MSFT commented

IMCEAEX-_o=NT5_ou=00000000000000000000000000000000

Hi,
I have started receiving this error message for new mail contacts for Outlook emails, and I have found the article list (with the same title as mine):

https://social.technet.microsoft.com/Forums/ie/en-US/d73d1e28-7cd7-4134-b0bf-493b0d70d8d6/imceaexont5ou00000000000000000000000000000000?forum=exchangesvrsecuremessaging

This 2016 article resolved the issue (manually creating an X500 address on the proxyaddress attribute), I just wondered what the cn=32bitcharacter@domain.com related to? The only thing I can find is if I open the .OAB file on a desktop computer with Outlook and search for the contact in:
C:\Users\username\AppData\Local\Microsoft\Outlook\Offline Address Books\oab\uDetails.oab

I didnt want to post my question on the same thread, but I just wondered how it generated that cn=number. Ive looked at the ad user and mail user and can see no other related info.

Im assuming its just an index the OAB gives the contact but wanted to double check.

Thanks
Gary

office-outlook-itprooffice-exchange-server-mailflow
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1 Answer

KyleXu-MSFT avatar image
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KyleXu-MSFT answered

@GaryJones-5152

This phenomenon is related with LegacyExchangeDN for X500 address. This phenomenon is caused by the cache of email address, you can also try to enter email address manually to solved it.

About why this X500 email address was named in this format, it decided by the internal working mechanism of exchange. If you want to know detailed information about it, you may need to open a ticket to check with Microsoft.


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