AT&T’s Dell Venue Pro is (as far as I know) the last Windows Phone device to get the Mango update. It’s rolling out as we speak and your smartphone probably already prompted you to get the latest version of Microsoft’s mobile platform. If you’re not sure how to proceed (and really it’s pretty easy) – check out step-by-step instructions at the Update Central site.
As usual, we advise you to backup your data like calendars and contacts just in case something goes wrong. Furthermore, your phone’s battery should be fully charged to have enough juice to finish the process.
Finally, if you have some additional questions, Microsoft invites you to check out their Answers service, where Windows Phone users (among other folks) help each other solve everyday problems…