Hi guys, take a look here:
This solved the "download unsuccessful" problem in my Samsung Galaxy Mini
"Many people have figured out that there is a compatibility issue between regular gmail accounts, googlemail accounts and google apps accounts (exchange). For google apps accounts, the marketplace only half-works. You can access it, but depending on the order in which you added your accounts and entered the marketplace for the first time, you will either get the download failed issue or stuck at starting download. My only theory is that android somehow gets confused when you have multiple google-centric accounts and doesn't know which one to use. After about 25 resets of my Samsung Captivate trying every combination to see what actually works consistently for me I found the following steps to work.
Reset device. Yes, it sucks, but I couldn't figure out a way to un-bind the accounts from the marketplace without doing it. You will find that when it's exhibiting the issue, you can't factory reset (at least on the captivate you can't) so you first need to run the clear user data procedure - hold volume key while powering on. Reset data then reboot. Your downloads will still be stuck, but at that point, the factory reset from software should work (Settings -> Privacy -> Factory data reset.
Once you have a fresh install, go to Settings -> Accounts and Sync and add your gmail account (NOT your google apps account). Order appears to be VERY important. Uncheck all the services you don't want to sync (everything for me is unchecked as this account is only there for the market place to work *shaking fist in Googles general direction*
Test the market, it should work now.
Go back to Settings -> Accounts and add your Google APPS Account as an Exchange connection (corporate) using your
name@domain.com as login and m.google.com as server. I found that when I try to add it as a gmail account instead of exchange, it doesn't break the market, but you lose the ability to sync your calendar - but if you do it in the other order the calendar sync option is there, but then the market doesn't work *shaking other fist in Googles general direction*. Excahnge it is then...
Once done, you should have two accounts - gmail which the marketplace will use to auth downloads that can be relieved from all syncing duties, and an exchange account for your google apps account to get calendar, contacts and email.
Now off to address the issue with exchange not being able to see all the subscribed calendars like gmail setup does *shaking foot in Googles general direction - ran outta fists*
Hope this helps someone"
by:
2wheeltraveler
From:
"Download unsuccessful" on all Market downloads. - Android Market Help