BlackBerry via their website last week announced that the BlackBerry Desktop Manager should support 32Bit Outlook 2010 by August 2010, but it will not support 64Bit Outlook 2010 until sometime in 2011.
The article states that:
“Currently, BlackBerry Desktop Manager 5.0.1 does not support Microsoft Outlook 2010 64-bit version for mailbox connectivity and synchronization of organizer data such as Calendar, Contacts, Tasks, and Memos. The next release of the BlackBerry Desktop Manager provides support for Microsoft Outlook 2010 32-bit version only. This release is targeted for August 2010. Support for Microsoft Outlook 2010 64-bit version will be available in 2011.”
The information is hidden away in this article: KB17149 – Support for Microsoft Outlook 2010 64-bit version
So if you are fed up of seeing the error message “No Available Message Stores”, the update to resolve this issue should be just over the horizon.
** UPDATE ** RIM have resolved this issue in the latest release of the BlackBerry Desktop Software.