Cmiquel, there are a lot of different pieces of software to help you sync your Aria. If one does not work, you can try another. I'm going to forward you somewhere that has all the software listed out in a chart: www.syncdroid.net
There are also Helpful Suggestions there and one in particular may be helpful to you. The Outlook data file is often corrupted and causes perfectly good sync software to fail. There is software from Microsoft that will repair that file. I suggest that those in this thread that are having error problems try to repair the data file and post back if that fixes things. Hope this helps.