Issues with Link/Unlink User button

Owned by Fernando Sayago (Unlicensed)
Last updated: Sept 13, 2017
1 min read

Problem

A message-window is shown after the user clicks the Link User (or the Unlink User) button, stating that "Value cannot be null \\ Parameter name: value)

After this, the results window (to Choose Mailbox Relationship) will only show one record : "None"

Solution

  1. Look for these files in the C:\Windows\System32 folder, and remove them: