AD Permissions on a specific User Attribute: ms-Exch-Extension-Attribute-5 Attribute

Hi

I would like to use the following attributes "ms-Exch-Extension-Attribute-5" & "ms-Exch-Extension-Attribute-6"for RADIUS software use.

RADIUS will simply insert a serial number on the field for users. This is nothing to do with Exchange 2010 (my mail server version)

Is it safe to use these 2 attributes for RADIUS or will Exchange read them also or will this cause a problem downstream somewhere?

Thanks, Maelito

Maelito