-Claims of no data loss problems.
-Ease of sync and transfer
-Easy to use GUI
-Can back up all data and settings
Looks like Mozy would require you to select all pertinent data files yourself, not sure what Outlook settings you could back up with this.
If all you want to do is back up the PST file, then what do any of these offer beyond drag-and-drop or xcopy?
Not sure about the MS Sync-Toy, if it offers all the sync or backup you need, and the backup and encryption options you want, no need to get anything new, really.
I think the biggest points of the Outlook Backup are:
-Easy to use for folks with little technical skills.
-Backup directly to optical media. (Or anywhere, including online backup solutions.)
-Dedicated program that does all the Outlook backup/sync functions in one place, with no non-Outlook options to confuse the inexperienced.
Of course, the other thing is just that someone is trying to sell something, and they think their something is better, cheaper, faster, whatever.
Not sure about the program in question, but sometimes 3rd party apps do a better job of backing up settings than the MS offerings.
Looks easier in general in Outlook 2007 to get everything backed up straight from Outlook itself. http://www.sitedeveloper.ws/tutorials/outlook.htm
I guess it all depends on what you want from a backup option.