People seem to think the companion CD has some kind of buried treasure on it...it doesn't. The companion CD is not very important - all it has on it is some user documentation (maybe), a copy of ActiveSync, which you can download from Microsoft's website, a copy of Outlook 2002, and maybe some demo software. In some cases, there might be a couple of free applications on it, but since the h2210 is a pretty old pocket pc, the applications that might have been included on the CD have probably been updated heavily and you probably want to purchase the most recent version of software (that's assuming your device even came with free software).
To sync your data between your computer and pocket pc:
You can get user documentation for the 2210/2215 from
HP's website.
Your Pocket PC can sync to Outlook 2002, 2003 or 2007. If you don't already have Outlook (the full version of Outlook, not Outlook Express) on your computer, you'll need to purchase it. If you google Outlook 2007, you'll probably find an
inexpensive version you can purchase.
You can download fully functional 30 day trial software for just about every piece of pocket pc software you might want to purchase directly from the developer's website.