Hello,
I got in contact with the apple people and this worked for me:
I understand that you had changed your email address and after that you were unable to update your applications on your iPhone that you purchased with old email address. I realize your eagerness regarding this and I am happy to help you with this.
Please try the steps below to sign into your account on your device. Be sure you have the latest iOS software before attempting to follow these steps. This article will walk you through updating your iOS device.
Backing up, updating, and restoring your iPhone, iPad, or iPod touch software
http://support.apple.com/kb/HT1414
To find out if your device is compatible with the newest update, see if it is listed among the compatible devices at the bottom of this page:
http://www.apple.com/ios/
The following article can help if you are not sure which model your device is:
Identifying iPhone models
http://support.apple.com/kb/HT3939
Once you know you have the latest software for your device, follow these steps to sign in:
1) Verify that you have access to the internet from your iOS device via EDGE, 3G, or Wi-Fi.
2) On your iOS device, tap the Settings icon on your Home screen.
3) Scroll down and tap the Store icon.
4) The Apple ID you are signed in with will appear on the next screen. If you aren't signed in, you'll see a Sign In button.
5) If you are already signed in to an account and the Apple ID that appears is different from the account you'd like to be signed in with, tap the Apple ID button then tap the Sign Out button that appears.
6) Once you are signed out, the Sign In button will appear. Tap it.
7) Now, tap the Use Existing Apple ID button.
8) Enter your Apple ID and your password in their respective fields, then tap OK to sign into your account.
If you sign in successfully, your Apple ID will appear in the Apple ID button at the top of the Store screen. You can press the Home button to return to your home screen once you know are signed in. You can then tap the iTunes, iBooks, or App Store icons to browse the stores on your device.
If you no longer have the password for your account, you can simply reset it from any computer via Apple's iForgot website at:
http://iforgot.apple.com