Cannot give Send on Behalf permissions - Exchange 2010

Hi everyone,

I am unable to give a user Send on Behalf permissions for a shared mailbox. The error says Couldnt find object "..." Please make sure that it was spelled correctly or specify a different object.

The object it is trying to find is of another user that was disabled long time ago. I tried to search about it and someone said to have a look at ADSIEdit. I dont know where to go on ADSIEdit and I need to be 100% before making any changes on the ADSIEdit. Please let me know if any of you have any ideas.
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Exchange UserSystems AdministratorAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Anything Exchange related will be under the configuration partition in ADSIEdit.msc

Will.

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