If your company already has Blackberry Enterprise Server (BES) set up, that will work well. BES is a very reliable synchronization platform.
If you don’t already have BES, you can get it via hosted Exchange Server with Direct Push technology and BES. This will allow you to access your email, modify your calendar, and manage your tasks from anywhere.
Otherwise, install Blackberry Desktop on your computer. Point your browser to na.blackberry.com/eng/services/desktop/ for the latest version. This application can sync your Blackberry when you connect it to your computer. It even lets you choose which tasks to sync.