Sync iphone to two computers without delete data

Hi everybody!
I want to sync an iphone4 to two computers, both of them running mac os X 10.5.8 and iTunes 10.
The first one, called home computer, holds apps, music, videos, podcasts, photos. I don't want to sync contacts and calendars on it.
The second one, called office computer, contains just that: contacts and calendars, and nothing else. Actually, it contains a few other items, but I don't care to sync them.
First, I disabled automatic syncing in both computers.
Then I synced the iphone to the home computer, checking all the requested panes: apps, music, videos, podcasts, photos. I unchecked just the info pane. Everything worked fine.
Troubles are coming syncing to the second computer, office computer.
I check the info pane (everything ok, so far). But when I uncheck the app pane, it appears a box asking (sorry not to be precise, I have to translate from italian) "Do you really want to unsync all apps? All apps contained in iphone will be deleted". If I choose not to sync, the multicolor bar below starts worringly to decrease, and the green part (apps) disappears.
I wanted not to sync the app in the iphone, not to delete them!
The same happens if I uncheck all other interested panes, i.e. music, videos, podcasts, photos.
The final result is a sad, short bar showing just a very small yellow strip, "other" meaning contacts and calendar.
What I have to do?

With the iPhone, you can sync all iTunes content with only one computer. Trying to sync iTunes content with a second computer will result in iTunes erasing the content from the first computer. However, non-itunes content such as contacts, calendars, mail settings, notes, etc. (anything in the Info pane) can be synced from another computer.
Do not allow your iPhone to sync until you have set up your selections. Prevent automatic syncing one time, without changing settings: Open iTunes. Then, as you connect iPhone to your computer, press and hold Command-Option (on a Mac) or Shift-Control (on a PC) until you see iPhone appear in the sidebar.
At home, make your selections from the Music, Videos, Applications, etc. panes, but leave the selections in the Info pane that you want synced from your work computer unchecked. When you are finished, click the "Apply" button at the bottom right of the iTunes window.
At work, Prevent automatic syncing one time, without changing settings: Open iTunes. Then, as you connect iPhone to your computer, press and hold Command-Option (on a Mac) or Shift-Control (on a PC) until you see iPhone appear in the sidebar. Make sure all options in all the panes you used at home are deselected (not checked), particularly the "Sync Music" at the top of the music pane.
Go to the Info pane and select your sync choices that you left unchecked at home (such as contacts, calendars), then click the "Apply" button at the bottom right of the iTunes window.

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Been searching the internet for several weeks now, and haven't managed to find anything that helps, so here's the deal: I've had an iPhone 4 for a bout a year or so now, and I just got a new Macbook Pro a few weeks ago. I had previously been syncing my iPhone to a shared computer, so obviously I couldn't just set up my new computer using the data of the old one. I wasn't too concerned about this, until I discovered that I couldn't sync my iPhone to the new computer without losing all of the data on it! So I'm trying to figure out how I can save my iPhone's data in such a way that I can restore it upon syncing to the new computer. To clarify, I don't need to save all of the data—I've already gotten my purchases and music transferred over, and I'm in the process of transferring my contacts and notes over, but I have no way of saving the other data. Most of it is superfluous, such as call records or web history—but I do care about game data and iMessage data. So it comes down to this: I need a way to be able to store save files for all my games AND all of the text messages in my iMessage app. I've seen lots of people recommend various file transfer programs, which I assume work for game data, but as far as I've been able to tell from the demos versions, all they'll do for iMessage is export conversations as pdf or text files. I'm not looking to save a hard copy of my text messages, I want to be able to upload them to my iPhone again as text messages (both sent and received). In other words, I'd like my phone to be pretty much exactly the same after syncing it as it is now. At least, as far as the iMessage/game apps are concerned. Maybe I didn't know how to use the file transfer programs, maybe I didn't download the right one, maybe there's another way to do it, I don't know. If anyone can help me solve this problem, I would greatly appreciate it.
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So, just in case anyone with the same problem happens to run into this post, I managed to find a solution to this problem. There's a $35 program called iBackupbot, which works for both Windows and Macintosh. It's basically an iTunes backup service, except that it functions independently. You can also do partial restores with the program. Anyway, it's a very useful program, and it can sync data from one device synced to one computer to another device synced to another computer (or to a restored device synced to a new computer). If you're willing to shell out $35 for the program, here are the steps to restore your iPhone's data:
Transfer all of your purchases from your old computer to your new computer, including music and videos. This program is good, but it only syncs data files, so music and apps cannot be synced over (that I can tell).
Download and register iBackupbot on your NEW computer (http://www.icopybot.com/buy.htm)
Plug in your iPhone
When you iPhone appears in iBackupbot, click on its name and then click 'backup now' on the information screen. It will take at least five minutes.Once the backup is complete, you might want to test it out. I'd recommend deleting a few pictures or messages, and then restoring from a backup, to ensure that the backup worked properly.
Quit iBackupbot. (It's a good program, but I've noticed that it's kind of glitchy, and it works best on the first action of each session)
Wipe your iPhone and set it up as a new one. Make sure you link it to the same Apple ID that your new computer is associated with.
Once your iPhone has been set up, sync it to your new computer and re-download all of your music, apps, and other purchases.
Change your iPhone's name (this is to check and make sure that iBackupbot recognizes your iPhone)
Reopen iBackupbot, and click on your iPhone's name when it appears.
Right-click the name and select 'restore from backup.'
Leave the settings alone, and check 'full restore'
This will take quite a while, and your iPhone will probably be glitchy when the restore is finished. Quit iBackupbot again, and then power your iPhone off and then back on.
Check all of your apps (including the system apps) to make sure that all of your desired data has been put back on your iPhone.For me, out of about 70 downloaded apps, 4 did not have any data when I had finished the restore. If this is the case, you can can try another full restore or do a partial restore this time, selecting only the apps that did not have data.
Once you're satisfied that your iPhone has all of the data you want, sync it to you computer to make sure that it will still sync to your new computer (you never know)
Change your iPhone's name to what you want it to be, then reopen iBackupbot.
Do a final backup of your iPhone in iBackupbot.
Sync your iPhone with your new computer one last time, and do a backup of it using iTunes.
You're done!
I hope this helps. Good luck to anyone who decides to try this method!

How to sync iphone on two computers

I use my desktop Mac Pro and its iTunes and iPhoto to do all of my music purchases, iphone games and apps purchases and manage my photos, and have my iphone synched to it, but I am going travelling and will be taking my MBP laptop.
My laptop iTunes/iPhoto has none of my music, iphone games and apps or photos on it so I know that if I connect the iphone to it and try to sync it, it won't work.
I would like to have all of the same music, photos and purchased games moved over to my laptop so that I can use it to keep my iphone synched and also be able to buy additional games and music and be able to update iphone games and apps while I am travelling.
Can anyone please advise me on how to go about getting the same stuff on my laptop so that I can use it to keep my iphone synched while I am travelling?
Thanks for any advice.

You're welcome.
Would copying my iTunes folder also bring along the purchased games and apps?
Yes.
All iTunes content is stored in the iTunes named folder located in your Music folder. You need to copy the entire iTunes named folder and place it in the same location on your MBP for iTunes on your MBP to be identical as of the time you copied the iTunes folder.
Can you please tell me how to authorize my MBP with my iTunes account?
At the iTunes menu bar, go to Store and select Authorize Computer. Enter the same email account being used for your iTunes account on your Mac Pro.
Will this cause problems if I try to use the Mac Pro for synching as well or will I only be able to use one computer at any one time with the iphone?
In regards to iTunes content, an iPhone can be synced with an iTunes library on a single computer only. When syncing an iPhone with an iTunes library on another computer, all iTunes content transferred to the iPhone from a different computer will be erased first. The same applies to photos transferred from your computer to your iPhone.
Contact info, calendar events, and Safari bookmarks can be synced with the supported applications on multiple computers.
You will be better off in the long run using one computer for your iTunes library and for storing photos in regards to syncing with your iPhone.

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Let me try to explain. I want my sync my work calendar and contacts from my work PC to my iPhone while maintaining everything else (music, apps, pictures, etc.) on my MacBook.
Can I sync my work PC Outlook calendar and contacts through the air using MobileMe and connect my iPhone only to my MacBook?
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I've had my Macbook Pro since June. I'm transfered all my apps and library to my mac. However I'm scared that if I sync it all the way I'll lose my text messages pictures and contacts.

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http://support.apple.com/kb/TS1474
http://support.apple.com/kb/HT1386
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Iphone will sync with one and only one cpomptuer at a time. Syncing to another will erase the current content and replace with content from the new computer. This is the design of the iphone.
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Is there ANY possible way to sync my iPhone with two computers. All I want to do is exchange songs between the two computers and sync my contacts and calendars. Seems simple to me, but I get a message every time asking me if I want to erase my iPhone or transfer the purchases. I do not have this problem with my iPod Classic 5th generation... strange.

This article: http://support.apple.com/kb/HT1296 provides more information about what can be synced and even merged between multiple computers.
You can transfer purchased music between computers as described here: http://support.apple.com/kb/HT1848
Syncing music that was not purchased from the iTunes store is intended to be a one-way-street as described here: http://support.apple.com/kb/HT1209
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I know I'm not qualified to answer all of your questions. I recently changed the computer where I'd like to sync my iphone. iTunes knows that my iPhone was synced with a different computer before and it only gave me 2 options, to proceed on the new computer which will wipe out all the contents on the iPhone. or to cancel. I take it from that experience that syncing iPhone on 2 computers is not possible.
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Sync iphone to two computers without delete data

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