Property Expression isn’t Valid: Exchange 2010 mailbox move

Problem:  When moving a mailbox from Exchange 2003 to Exchange 2010, I would get a failed error with the following explanation:

Error:
Property expression “Small Conference Room” isn’t valid. Valid values are: Strings formed with characters from A to Z (uppercase or lowercase), digits from 0 to 9, !, #, $, %, &, ‘, *, +, -, /, =, ?, ^, _, `, {, |, } or ~. One or more periods may be embedded in an alias, but each period should be preceded and followed by at least one of the other characters. Unicode characters from U+00A1 to U+00FF are also valid in an alias, but they will be mapped to a best-fit US-ASCII string in the e-mail address, which is generated from such an alias.

Solution:
This problem is caused by the space between the words “small conference room.”  Within active directory users and computers go into the properties of the object and select the “Exchange General” tab.  Modify the alias.  You can either ad hyphens, underscores or eliminate the spaces all together.

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