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I want to be able use a script to write/read from extensionAttribute1-15

I was wondering where I could find more info about the size of these fields, what can be written into them. I've used google, but I dont think I'm either searching for the right thing, or I just can't find anything.

Anyone helpe me out?

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If you load and use ADSIEdit from the admin tools, you can view the schema for more information. In the meantime, look here for more: It appears to be a Unicode string

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For length, see the optional rangeUpper attribute that is associated with the ms-Exch-Extension-Attribute-1 attribute.

For Unicode strings, rangeUpper specifies the maximum number of characters. In the case of the ms-Exch-Extension-Attribute-1 attribute, it is 1024 characters.

The type of the attribute is determined by the combination of the attributeSyntax ( and the omSyntax (64). In this case, a unicode string.

The attribute is replicated to the global catalog (isMemberOfPartialAttributeSet=true)

[MS-ADTS]: Active Directory Technical Specification: LDAP Representations

Attributes Added by Exchange

ms-Exch-Extension-Attribute-1 Attribute

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