the iPhone could not be synced because this computer is no longer authorised for purchased items that are on this iPhone

I have a same problem. I try to do as your recommends. I try to log out and log in on my both devices (MacBook Pro mid2012 OSX 10.9 and iPhone 5 iOS7) but it can not sync again. And I deleted all my apps on my iPhone but it still the same. Please help me to solve this problem.

john,

i have disame problem and your tip works..thank you very much..

i rebooted by iphone and sync again, the problem was solved.

I trided all the suggestions on this thread and nothing worked. Finally I did a complete restore on my iPhone and the problem was solved.

I also saw this message appear today while attempting to migrate from my older iphone to my new one. The new one had beeen provisioned by my company so it had an mdm client installed using a different apple id; I suspect this was causing the problem. As soon as I fully erased the new iphone and restored from my encrypted backup (which also transfers passwords), the process seems to proceed just fine.

This is riduclous Apple really dropped the ball here.

This needs to be FIXED. I can't sync Safari bookmarks, only apps and music, don't understand why everything was FINE in OS6, I update thinking everything wil be better...and POOF nothing but this annoying problem syncing.

My Apps are not authorized? I only have ONE account.

But since I had to change my username to a NEW email ( why can't I use my ORIGINAL EMAIL???? Why the hassle??? ) to use icloud if this is causing the problem it's their fault.

I'm not deleting all my ****** Apps and reinstalling EVERYTHING from SCRATCH.

That's not an option. Why do we have to waste our time and energy?

They have more money than the USA, hire someone who knows what they're doing instead of ANNOYING YOUR CUSTOMERS with these syncing problems

I tried everything except deleting al the data on my phone which is not going to happen, Sync button gives me this problem every time.

For those who are still struggling with this issue:

Assuming you have 50 apps on your iPhone, 48 of them were downloaded from 1 apple account, and 2 of them were downloaded from a different apple account (lets say this is not a frequently used account and you might have even forgotten that you ever used this account like me!), this is when iTunes gets pretty confused and repeatedly asks you to authorize. This is when you need to really remember that near-forgotten ID and authorize iTunes using that account.

As long as those 2 apps are still on your iPhone, I think iTunes needs that apple account.

This is the reason, restoring the whole phone seems to work for some people here. Because once those 2 troublesome apps are gone, ITunes is no longer wondering where those 2 apps got downloaded from and it stops asking you for authorization.

Hope this helps someone.

i just signed out from itunes.then tried to sign out from device.it was not signing out from device.then i tried to restart the device.it worked!

the iPhone could not be synced because this computer is no longer authorised for purchased items that are on this iPhone

god job john...it's works for me..thanks a lot.

Hey...just try like i say..problem will be resolved...

In itunes...click file---->devices----->sync iphone

iphone will be synced...it works..try it out...:)

You can go to these website to solve your problem:

http://support.apple.com/kb/HT1420?viewlocale=en_US&locale=en_US

http://support.apple.com/kb/TS1389?viewlocale=en_US&locale=en_US

It worked perfectly for me.

This happens when you use multiple id (email addresses) to download it. Same this happened to me.

Here's what can be done,

Sync you app to itunes first or if it is already in your itunes app folder select the app and get the info ( Cmd I). Itunes will show you the apple id used to download that app. Now all you got to do is sign in to itunes with that same apple id and sync it to your iphone/ipad. This will definitely solve your problem.

I also have the same problem. I just got the Iphone 5s and I'm trying to sync music on my phone and this keeps popping up. I feel like I've tried everything. Whenever I authorize the computer, it says its already been authorized.

This did not work for me