We have experienced some users are not able to set Delegates in outlook.
Apparantly this is due to the following permission setting not being set:
SELF - Write Personal Information
To solve the Delegates issue, we set this permission on the User object security settings in AD.
However, after a little while, the permission is reset (removed) again, thus making delegates unusable again.
I've been looking through the permissions of the OU etc. without any luck of "spotting" wherein the problem lies.
Do someone have a good suggestion on this matter?