I discovered this week that an upgrade to BES 4.1 will solve the problem of 'hard deleted' items in Outlook. BES 4.1 does now support hard deletions, this also includes items moved into Personal or Public folders. With 4.1 these are all properly removed from the device once they are gone from the mailbox.

Here are the other points of interest from the 4.1 feature list:

Instant Messaging
Windows Messenger Blackberry client

PIM/Organiser
Address Lookup Enhancements

Attachments
Attachment viewing pan and zoom enhancements
Enhanced PowerPoint viewing

Administration
Backup and restore of saved messages
SMS, Phone calls, and Messaging can be audited
Enterprise device authorisation - administrators can choose what sort of devices can connect to the server

The bad news is the upgrade from 4.0.x is not free. You have to source it from your mobile carrier, and the cheapest I have found is £650 from BT. It's going to be a case of the users deciding if these enhancements are worth the one-time cost.

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