A reminder: for the best MobileMe experience you should use the latest version of Mac OS X v10.6 Snow Leopard (if you use a Mac), iTunes 9 and MobileMe Control Panel 1.5 (if you use a PC), and iPhone OS 3.1 (if you use an iPhone or iPod touch).

With Find My iPhone, you can help protect the information on a missing iPhone by remotely assigning a four-digit passcode lock. This is especially useful if you've never set a passcode before or if you want to set a new one.

To use this new feature, first install the iPhone OS 3.1 Software Update. Then if you want to remotely set a passcode lock, log in to your MobileMe Account, choose Find My iPhone in the column on the left, and click Remote Lock.

If you are already using the MobileMe Control Panel, you can simply upgrade to iTunes 9. This will update the control panel automatically. If you are installing for the first time, follow these instructions.

With QuickTime X in Mac OS X Snow Leopard, a new version of the QuickTime Player lets you publish QuickTime video directly to your MobileMe Gallery. Just launch the new QuickTime Player and open any compatible movie or record video with the built-in iSight camera on your Mac. Then simply go to the Share menu, select MobileMe Gallery, and follow the on-screen instructions. When you complete the process you'll see a clickable link to the web page containing the movie. To manage movies, images and albums after you've published them, login to MobileMe and select the Gallery icon.

The new MobileMe iDisk app brings the convenience of iDisk to your iPhone and iPod touch. You can directly view files including iWork and Microsoft Office documents, PDFs, and QuickTime movies. And if you want to share a file with someone else, just tap the share icon next to the file to email a download link that works great with both small and large files. Watch this video to see how it works.

To install the free iDisk app directly on your iPhone or iPod touch, make sure you are running iPhone OS 3.0 and then:

You can also download the app using iTunes on your computer and it will be installed the next time you sync your device.

One simple way to increase the security of your life online is to change your account password periodically. You can change your MobileMe Account password at any time by logging into me.com and clicking the Account icon. On the Account page, click Password Settings, enter your current password and then a new one, click Save and it's done. (See this help article for tips on picking a good password.)

Don't forget to enter your new password in the system settings for all the devices where you use MobileMe services. Use the MobileMe System Preference (Mac), the MobileMe Control Panel (PC), and the Mail, Contacts, Calendars section of Settings (iPhone and iPod touch) to enter your new MobileMe password.

The other option for resetting a forgotten password is to have an email sent to an alternate email address with reset instructions. This only works if the email address is active so you'll need to remember to change it if you switch to a different one. You can do so by logging into your me.com Account page and selecting Personal Information.

With the iPhone OS 3.0 Software Update you can search your MobileMe Mail on your iPhone or iPod touch, including messages stored on the MobileMe cloud (server). To take advantage of the capability, begin by installing the iPhone OS 3.0 Software Update if you haven't already. Then select your Inbox or another folder from your MobileMe Mail account and access the search field by scrolling to the top of the message list. (Tap the status bar at the top to quickly reveal the search field.) Type what you want to search for and tap To, From, or Subject, or All to search all three. You'll see the messages that match the search on your device, and you can then tap "Continue Search on Server" to see the remaining messages that are stored in the MobileMe cloud.

A reminder: for the best MobileMe experience, you should use the latest versions of Mac OS X 10.5 Leopard (if you use a Mac), iTunes and MobileMe Control Panel (if you use a PC), and iPhone OS 3.0 (iPhone or iPod touch).

To get started, use iTunes to update your iPhone software to iPhone OS 3.0, and then follow these steps:

We also recommend setting up a Passcode Lock on your iPhone, so only you can turn the Find My iPhone feature on and off. Go to Settings and tap General followed by Passcode Lock.

If your iPhone goes missing you can log into me.com on any computer to access Find My iPhone (under Account) and display your iPhone's approximate location on a map, write a message to be displayed on its screen, and play a continuous sound for two minutes even if the iPhone is set to silent. Or if you fear the worst, you can initiate a remote wipe to permanently erase your personal data and restore the iPhone to its factory settings. Watch this video to see how it all works.

MobileMe members who use iCal on a Mac can publish calendars to MobileMe to share with friends and family. To publish an iCal calendar, simply click the calendar and select Publish from the Calendar menu. You can then send an email inviting other iCal users to subscribe.

Your friends and family can now subscribe to your published calendars and view them on their iPhone or iPod touch running iPhone OS 3.0. They simply view the invitation email on their device and tap the link to set up the subscription to the calendar. For more details on how to publish calendars to MobileMe and subscribe to them, please read this support article.