Is there a proven way to block all Blackberry's that access Exchange 2007 via OWA? It is against my company policies to store password with 3rd party (BIS) as well as not having the ability to apply policies, remote wipe if lost, etc.
Now I know I could block all the BIS subnets at the Firewall but this could be problematic. We have users who use NotifyLink or AstraSync which works with Exchange's ActiveSync thereby allow our policies to be applied to protect the device. These applications however use the BIS network and blocking the BIS subnets at the FW would block these users as well (may have to go down this road anyway).
I can also put to rest implementing a BES as our company has decided against spending money which is not needed when so many devices have ActiveSync ability.
We are looking at allowing our users to pick the mobile device they like the best or are more comfortable with.