I was trying to configure outlook today morning and found following error messages

Error| Exception : |NativeError:61b8 HResult 80040e2f Message: A duplicate value cannot be inserted into a unique index. [ Table name = MetadataSchema.EntityClientStatistics,Constraint name = PK__MetadataSchema.EntityClientStatistics__00000000000007A9 ]|    at Microsoft.Crm.Application.SMWrappers.CrmSqlCeCommand.ExecuteCommandWithRetry[TResult](Func`1 body, Int32 retryCount) at Microsoft.Crm.Application.SMWrappers.CrmSqlCeCommand.ExecuteNonQuery()

Resolution for this

Uninstalling plugin profiler solution helped me to configure my outlook client.