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Exchange Team Blog
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Custom (aka. Extension) attributes in Exchange 2010 SP2 (and later) and their use

Nino_Bilic's avatar
Nino_Bilic
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Jan 17, 2012
  Some of sharper readers of our documentation talking about schema changes that Exchange makes (see Exchange Server Active Directory Schema Changes Reference, November 2011) have noticed that in E...
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Anonymous's avatar
Anonymous
Feb 22, 2012

Just so the point isn't lost - are you all going to update the Exchange EMC to refer to the Custom Attribute 1-15 to Extension Attribute 1-15? Otherwise how are we going to differentiate between the old custom attribute 1-15 and the new custom attribute 1-5?