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Event ID: 291 Source: MSExchangeDSImp

Unable to create Mailbox Username because the required Home-Server attribute was not specified.
As per Microsoft: This issue can occur because the import file needs the Home-Server column in the header to create a new mailbox. The default mode is update, which creates the object if it does not exist or modifies the object if it does exist. To resolve this issue, add the Home-Server column to the Header.csv file.
I received this error while importing (append) changes to the accept delivery from particular distribution lists. I was adding the DLs under the "Accept messages from" header. Adding the DLs under "Accept messages from DL" corrected the issue. Tho, ~30% of the import was successful when the DLs were added to the "Accept messages from" header.

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