I bought this keyboard for use with my ATT 8525 Smartphone running Windows Mobile 6.0. It works well with one small deficiency -- there doesn't seem to be a key combination that triggers the "OK" function on the phone, which is chiefly used to close Windows. Whatever the key labeled "OK" on the keyboard does, it doesn't do this, and I can't find another one that does.Purchasers should be aware that this product is no longer being supported by the manufacturer or anyone else. The installation CD was designed for use with Windows XP (or earlier versions of Windows) and did not work properly on my Windows Vista machine, failing to download the keyboard driver into the smartphone. Fortunately, I was able to find a Windows XP machine and installed the keyboard driver successfully from it. The alternative of installing the driver by downloading directly "over the air" into the phone doesn't work either, since the website that it requires no longer works.Installation issues aside, this is a nice keyboard for road warriors who would like to be able to do serious email from a smartphone but have been impeded by lack of a real keyboard. With this keyboard and my phone, I can now leave my laptop at home for some business trips.