Process mad.exe () (PID=2356). Object [\Default Offline Address List]. Property [PublicFolderDatabase] is set to value [domain name /Configuration/Deleted Objects/Public Folder Database

DEL:9e3c1a6b-7c91-4fe4-b32c-cca73a355533], it is pointing to Deleted Objects container of Active Directory. This property should be fixed as soon as possible.

Solution: This worked for me

http://blog.ronnypot.nl/?p=212