There is a problem with the last version of N Suite with outlook contacts. The first sync works fine, once you start a second sync, the forename (first name) is merged to the last name field on the suite AND on the Outlook side. The only way to correct it is to delete all contacts in NS suite, all contacts in the phone, all contacts in Outlook and restore the outlook contacts from a save. Then run the sync ONCE and switch it off. Going back to PC suite is the best until the issue is solved..
Could you try to reproduce the error and provide us the system properties and log files?
Please follow the instructions to collect and submit the log files via this link http://tiny.cc/ja40z
Thank you in advance!