Ldap attribute to use for 3rd party program

Hello Everyone,

I was tasked with using an existing ldap attribute or create a new one that will be used for a 3rd party apps workflow. The attribute will need to support text and not just numbers,

I am hesitant to create a new attribute for this since attributes cannot be deleted once created and I have no idea if this 3rd party workflow will even stick around.

 I was thinking to just use an existing attribute in AD that is not currently being used. Does anyone have a good recommendation on which attribute would be a good candidate for this? I have been looking them over but each time I think I find one I discover that it is not a good idea to populate for misc. reasons (displays in GAL, messes with Azure AD Connect, etc..).

Domain is 2008 R2 with Exchange 2012 on-prem and using Azure AD Connect for O365 migration. I believe those are the only things integrated with AD at this time.

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Shaun VermaakTechnical SpecialistCommented:
Check MS-Exch-Extension-Attribute (1-15). I have used 15 before
Kevin StanushApplication DeveloperCommented:
Other than ExtensionAttribute1 through ExtensionAttribute15, there are a bunch of other unused attributes, but their names are more specific, like DepartmentNumber, etc.    If you right click on a user in ADUC, go to the Attribute Editor, and scroll through the list of attributes, you can see if another unused one fits better, then Google for that name to see if anything else uses it.
RMChelpAuthor Commented:
Thanks for the advise. Not sure why but when I look at the msExchExtentionAttribute , mine start at 16 and go to 45. I do not see 1-15
Shaun VermaakTechnical SpecialistCommented:
If those are blank, use one

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RMChelpAuthor Commented:
I used "extensionAttribute1" thanks for pointing me to this.
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