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BlackBerry Desktop Software

Microsoft Outlook® 97/98/2000/2002/2003 (Corporate or Workgroup installation)

Email account on a Microsoft Exchange® Server version 5.5 2000/2003

Internet/email enabled PC with Intel486 processor or higher

One available USB port

BlackBerry Enterprise Server

Microsoft Exchange® Administrator 5.5 (with Exchange Service Pack 4 installed) or Microsoft Exchange® 2000/2003

PC with Intel® Pentium® III processor or compatible (500Mhz or higher, 512MB RAM, 1GB free hard disk space)

Windows® NT 4.0 (Service Pack 4 or higher) or Windows® 2000 Server (SP3 or higher)

Administrative permission to relevant Microsoft Exchange® Server

Permanent connection to the Internet via a firewall

How It Works
We've just added an article outlining how blackberry actually works, view it here.
If you're interested in finding out if blackberry is available in your country at this time, check out the coverage page - you can find it here.
Out Of Memory
Are you experiencing the infamous blackberry "Out Of Memory" error, if so, click here to find out common causes and several solutions.