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

Just had same issue and nothing worked. Did not want to restore heres my fix.

Went to app store on Iphone and there were about 6 apps that hadn't updated, when I went to update them they failed because my kids had used their sign ins to load the apps on my phone when it promted them.

I deleted all of these apps that had been dowloaded from their accounts and it synced (exactly what the message says) So if you do not want to wipe your handset and do not know what apps are authorised or not just make a note of them all, delete them and resync, any that are missing reload using your account details.

I had the similar problem. I couldn't sync my musics because itunes need to sync my apps first but it shows 'the iPhone could not be synced because this computer is no longer authorised for purchased items that are on this iPhone'. So the sync stops. I authorised to my computer, but it doesn't work.

Finally I found this problem caused by my apple account. I changed the reigion of my account from country A to country B recently. I used the same account ID but registed in country B to authorised my computer but the apps are bought with the same ID but registed in country A. So the problem comes.

To solve it, I chaged my ID registed reigion back to country A and deleted 'C:\ProgramData\Apple Computer\iTunes\SC Info' folder (hiden folder). After that, authorised my computer again. Then I can sync my apps and music.

Hope this help a little bit.

Enki: someone else previously (you, maybe?) suggested changing the region back, and I thought that perhaps it might work for me. I had a go, but it is a bit of a rigmarole, involving entering a new credit card and an address in the previous region. I found that I simply wasn't able to do that: I could edit the credit card but not the address. User-friendly is not the way I would describe the Apple store!

Now I still get the endless "authorise - already authorised" loop, but most of the apps work and can be synced, despite what the pop-up box says. I expect I'll find what ISN'T working shortly, and then I'll be back here looking for a proper solution.

Thanks for the suggestion, though.

Solved this problem....

I am using iphone 4 on ios 7 on Windows OS Dell Laptop 1534

De-authorize my Apple ID

Log out of my Apple ID both on laptop and on mobile as well

restarted my system and turn off my iphone and turn on my iphone as well

Re-login on laptop and mobile, Authorize my PC for sync

Problem Solved.

Thank you!

M Imran Noor Glad it worked for you but I tried step by step as you instructed twice and didn't work on my 5S and OS Mavericks 😟

I had this Problem, But i resolved,

I think this happens when we purchase in more than one computers with same AppleID in iTunes,

Delete the apps from your iPhone which you purchased via secondary computer,

And Try Syncing your iPhone in your Primary computer, it should sync without any warning..

This solved my problem, I didn't red the discussion fully, sorry if i repeated somebody's reply..

I am using the following :

iPhone 5C,
iTunes 11.1.3 in Primay Computer,
iTunes 11.1.1 in Secondary Computer

If this solved your problem, please comeback and let others know..

Thank you

I don't have a second computer, I only ever had 1 ID except when I had to switch to iCLOUD and change my username to an email.....then problems began.

Can't log in with my old login as it's gone since I was FORCED to change to use iCloud.

This is an apple problem we shouldn't be dealing with and months later as it's still unrseolved.

I might imagine deleting all my apps and re downloading them might work but this is an extreme hassle as I have dozens of paid apps and will I'll loose all my preferences, ie like with my GPS all my input locations will be deleted...and no guarauntee it will even work.

I shouldn't have to do this and not even be sure it will work when Apple should just FIX IT!

i got the solution..!

throughout your apple and buy some android device..

Because of 1 problem? hahaha that's hilarious.

Dear Apple, if you please with this statement

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

will show us the list of apps which isn't authorized on our computers (instead of this bug in law http://support.apple.com/kb/TS1389) it will save all of us from millions hours of idiotism.

Thank you in advance from all of your customers.

I tried EVERYTHING on this thread to get my iphone to sync and nothing worked EXCEPT........

back up, then restore from back-up.

That worked.

Click on your iPad/iPhone name in Devices.

Click Back Up Now.

If there are purchases that need transferring click Transfer Purchases.

When there are problems with tranferring purchases it will give you a list of apps which aren't authorized on the computer.

Less obvious then it should be and still very annoying.

Thanks for you , after i read this it works fine with me .

Bro You are Genius It Did Work For Me and Boy it was A great Relief ..
Thanks

It was a cryptic situation for me with the error message from Apple being less than helpful. After 8 hours of fooling around with this issue I just gave up and reset the phone to factory settings and started adding stuff back in. That worked. Why hasn't some newspaper written the story. "50 billion dollars of user time wasted by Apple customers trying to get their iphones to work"