This can happen after you’ve mail-disabled the object, but there’re still references to it in other AD objects.
Microsoft Exchange 2013 Server Error '2158'

Josh Wilson
1
Reputation point
Hi,
I am tyrying to resolve Error ID 2158 - Microsoft Office Server Search.
It has also been causing the following error codes every 5 minutes and can't figure out what has happened overnight.
- 36887
- 1012
- 4087
- 106
- 4109
- 7032
- 106