Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do NOT buy this if you are a single user...

PLEASE NOTE This unit does NOT synchronise fully with your desktop email program unless you are using it as part of a corporate network. After endless hours on the phone with cingular and blackberry tech support it transpires that you must buy an additional $3,000.00 server to make this unit synchronise effectively with Outlook or other desktop organizers. This is not as advertised! Furthermore, the instructions for the blackberry are completely inadequate as are the online help options. I am furious and have returned my blackberry to cingular for a full refund.