how to do “Apple id” Considerations ?
Before you can move to iCloud, you’ll need one crucial bit of information: your Apple ID and password. The Apple ID is the glue that holds all your iCloud information together. You may already have an Apple ID, because one is required if you’ve ever bought anything from the iTunes Store or Mac App Store. And Mac OS X users have been prompted to create an Apple ID when they set up their Macs for years
The Apple ID must be a valid email address, and is usually a me.com address, which Apple will give to you for free. You’ll create and sign into your iCloud account using a single Apple ID, which will then be the Apple ID you use for all iCloud services (but there are caveats; see the “Dealing with Multiple Apple IDs” sidebar later in this section).
Under Mac OS X Lion, your Apple ID can serve as an alternate set of credentials to your usual username and password for services such as file sharing, screen sharing, and account recovery. In Lion, the Apple ID is integrated into the Users & Groups preference pane (A).
(A) In Lion, there is now an entry for Apple ID in the Users & Groups preference pane
Dealing with Multiple Apple IDs
Over the years, you may have created more than one Apple ID. For example, you may have created and used a particular Apple ID with the iTunes Store (say, the email address you got from your ISP), and you had a MobileMe address. Both of those can count as Apple IDs. If you previously had a .Mac account, you may have both a me.com account and a mac.com account, which are aliases of one another. And either can be used as an Apple ID.
The obvious solution would be for Apple to offer the ability to consolidate multiple Apple IDs into one. Unfortunately, if you already have multiple Apple IDs, Apple simply isn’t offering that ability as of yet. You do have the option of creating, managing, and resetting the password of your Apple ID account . But by not allowing a person to consolidate multiple Apple IDs they may have picked up over the years, Apple is throwing the management burden onto that person; not exactly consistent with Apple’s vaunted philosophy of simplicity.
It’s worth pointing out that if you have previously been sharing your Apple ID with others (perhaps because you have been sharing your iTunes library using Home Sharing,or to share purchases form the iTunes Store), those people now have access to your account on a Lion-based Mac, either over a local network or remotely via Back to My Mac. Before you upgrade to iCloud, it’s a good idea to reflect upon your security requirements, and if necessary, change the password associated with your Apple ID. Along the same lines, now is the time to think about how secure your Apple ID password is. If it is easily guessable, a word that is in a dictionary, a consecutive sequence of numbers or letters, or otherwise weak, I strongly recommend you change it to a stronger password before moving to iCloud. A quick Google search using the phrase “making a good password” will lead you to much good advice.
If multiple people use a single Apple ID (for example, if your entire family has been using your Apple ID for iTunes Store purchases) you can still do so for that purpose, but each person will have to create a separate Apple ID/iCloud account for syncing and backup of their personal devices.
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