Activesync with Exchange 2013 does not work, ADMINSHOLDER Flag (an old bad friend) ERROR YOU SEE: Access+is+denied.%0d%0aActive+directory+response%3a+00000005%3a+SecErr%3a+DSID-03152612%2c+problem+4003+(INSUFF%5FACCESS%5FRIGHTS)%2c+data+0%0a_ We just had a user with Activesync with a user migrated from 2007 to 2013. The user was fresh made on 2007 and migrated forth and back a few times. https://testconnectivity.microsoft.com/ Did show all info he can get … Continue reading Exchange: Activesync 1053 Event, 4003 Error 2007/2010/2013/2016 Adminsholder