Insufficient access rights to perform the operation
If you get the error message "Insufficient access rights to perform the operation" when trying to enable a user for Lync, do the following:
Go to Active Directory Users and Computers (with Advanced Features turned on in the View Menu), then go to Properties on the User that you can't enable on Lync, and in the Security tab, clic on Advanced. Then check "Include Inheritable Permissions from this object’s parent", accept and the problem will be instantly solved.
