Using Exchange. There are a bunch of errors on the console related to Outlook. Here just a few of them, the last ones:
9/30/15 7:38:36.265 PM Microsoft Outlook[4699]: dynamic_cast error 1: Both of the following type_info's should have public visibility. At least one of them is hidden. 17IDataSourceClient, 18CCalDatabaseClient.
9/30/15 7:39:47.141 PM SyncServicesAgent[4708]: [0x2701d70] |Miscellaneous|Error| SyncServices precondition failure in [ISyncConcreteManager registerSchemaWithBundlePath:]: No Schema.plist found in bundle at /Applications/Microsoft Office 2011/Office/SyncServicesAgent.app/Contents/Resources/AppleContactExtensionForOu tlook.syncschema
9/30/15 7:39:47.142 PM SyncServicesAgent[4708]: [ISyncConcreteManager registerSchemaWithBundlePath:]: No Schema.plist found in bundle at /Applications/Microsoft Office 2011/Office/SyncServicesAgent.app/Contents/Resources/AppleContactExtensionForOu tlook.syncschema
9/30/15 7:39:56.423 PM SyncServicesAgent[4710]: [0x270a550] |Miscellaneous|Error| SyncServices precondition failure in [ISyncConcreteManager registerSchemaWithBundlePath:]: No Schema.plist found in bundle at /Applications/Microsoft Office 2011/Office/SyncServicesAgent.app/Contents/Resources/AppleContactExtensionForOu tlook.syncschema
BTW: your help is really appreciated