Article ID: 152727 - View products that this article applies to.
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When you import a comma delimited file into Microsoft Exchange Server by using the Microsoft Exchange Administrator program, and a blank value is included, the existing value on the General tab of the Mailbox properties page will not be replaced.
If there is a value on the General tab, the comma comma value (,,) import will not change the value to blank. The same will occur if a comma space comma is used (, ,). To replace a value on the General tab of the Mailbox properties page, the imported file must contain a comma double-quote space double-quote comma value (," ",).
For additional information on removing fields, please see the following article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/152854/EN-US/ )XADM: Using Bulk Import to Remove Data
Article ID: 152727 - Last Review: September 30, 2013 - Revision: 3.3