The Mobile Gadget News website has posted a review of Developer One's Power Calendar for Windows Mobile Smartphone:
"As I see it, there were two major things missing from the SmartPhone operating system as it comes on the phone, a good e-book reader (preferably Palm Reader) and a powerful calendar application. I would go as far as to say that all Windows CE devices have had weak calendar applications. Every device I have had so far, I have always used a PIM replacement program. For SmartPhone, there has not been any options yet, but just around the corner you will be able to get Power Calendar by Developer One and guess what, as the name suggests, this program will give your calendar some power for a change.
Power Calendar is compatible with SmartPhone 2002 or 2003 and once released to the public, it will be a signed application so even application locked phones will be able to use it."