Ugh! It was so annoying. Here’s what fixed mine:

- Delete Gmail email account from your iPhone. Settings -> Mail -> Account -> Delete Account

- Reset your network settings. Settings -> General -> Reset -> Reset Network Settings

- Add Gmail account again . Settings -> Mail -> Add account -> Other

- Follow the instructions from Google: http://mail.google.com/support/bin/answer.py?hl=en&answer=77702

If you see this error  saying “You are not authorized to install the apps” go to “Store” - > “Authorize computer” in iTunes and click on “Authorize”. This should fix it.

I got this error when I installed the new update on iPhone and was trying to download apps from my work computer.

Very cool program (from the creators of Camtasia) to make screenshots and video - lets you save it as file, upload to Jing’s online storage (free!) or Flickr or FTP.

http://www.jingproject.com/