Remarks: If a value that you supply contains spaces, use quotation marks around the text (for example, "CN=John Smith,CN=Users,DC=microsoft,DC=com"). ...

Remarks:
If a value that you supply contains spaces, use quotation marks 
around the text (for example, "CN=John Smith,CN=Users,DC=microsoft,DC=com").

If you enter multiple values, the values must be separated by spaces
(for example, a list of distinguished names). 

Commas that are not used as separators in distinguished names must be
escaped with the backslash ("\") character
(for example, "CN=Company\, Inc.,CN=Users,DC=microsoft,DC=com").

Backslashes used in distinguished names must be escaped with a backslash
(for example,
"CN=Sales\\ Latin America,OU=Distribution Lists,DC=microsoft,DC=com").