Ensure that Exchange 2010 Update Rollup 1 is installed on the Exchange 2010 server. This package is available here - http://www.microsoft.com/downloads/details.aspx?FamilyID=371add31-d7a0-4...
Create a domain user account called BesAdmin
On the Exchange server, in the Active Directory Users and Computers console, create a domain user called "BesAdmin" and assign it an Exchange mailbox. Set the user account password to never expire.

WICKSoft (http://www.wicksoft.com) develop remote access solutions for BlackBerry that extend the native functionality of the BlackBerry Enterprise Server (BES) solution, enabling access to shared and public address books and calendars, as well as network file shares and Sharepoint workspaces. Sharepoint and Exchange versions 2003 and 2007 are currently supported.
Although the solution is currently limited to BlackBerry clients, the company have a version for both Windows Mobile and the iPhone in the works scheduled for release imminently.

RIM have officially added support for Exchange 2010 to BlackBerry Enterprise Server 5. Following hot on the heels of SP1 for BES 5 (http://blog.brightpointuk.co.uk/service-pack-1-bes-5-released), both RIM and Microsoft have released updates for BES 5 and Exchange 2010 to enable compatibility.
The pre-prequisites are therefore:

Service Pack 1 for BlackBerry Enterprise Server 5 is now available, bringing the version number up to 5.0.1
The update, which weights in at 657MB for Exchange and 667MB for Domino, is available for download from the BlackBerry web site - https://www.blackberry.com/Downloads/browseSoftware.do
New features in this release include:
In the unlikely event that your BlackBerry refuses to load one day and simply displays an error message on the screen reading "Error 302 - Reload User Software", all is not lost. You can re-load the software from your PC using the BlackBerry Desktop Manager application.
The BDM can be downloaded free of charge from the BlackBerry web site here - http://na.blackberry.com/eng/services/desktop/
Install the software before connecting your device to the PC via the USB cable if you have not done so already. The main dashboard will be displayed:

In this article I shall look at what to check when your BlackBerry users are unable to either receive mail, send mail, or both.
This article will only examine how to troubleshoot BES when deployed against an Exchange server rather than Domino or Groupwise.

The BlackBerry Enterprise Server (BES) product supports both OCS 2005 and 2007 versions, but uses the Communicator Web Access (CWA) component of the solution, so this feature needs to be installed on the OCS server itself.
Verify that the CWA web site can be accessed from the browser on the BES server, ensuring that DNS is correctly configured and installing any SSL certificates if required:

RIM will soon be releasing a version of the BlackBerry Desktop Manager software for the Mac platform, although a version has already surfaced on the web, which was used to create this post.
In order to use your BlackBerry as a modem with your PC to connect to the Internet via your cellular provider, you will need to have data service enabled on the SIM card in the BlackBerry device in addition to BlackBerry service.
The BlackBerry Desktop Manager software, available for free download from the BlackBerry web site (https://www.blackberry.com/Downloads/entry.do?code=A8BAA56554F96369AB93E...), includes an IP modem configuration wizard that is configured with the required connection settings for a wide variety of popular global cellular provider.
One new feature made possible with the release of version 5 of the BlackBerry device software (when used in conjunction with a BES 5 server), is the ability to access and search remote file systems: both Windows and Samba-based.
To add the file share to the BES, log into the BlackBerry Web Administration Console (remember that if using the BAS' internal authentication mechanism, the default username is 'admin' rather than 'besadmin').