Support UPN login

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Enter UPN e.g. name@example.com as the login
2.
3.

What is the expected output? What do you see instead?
I except to be able to use UPN login instead of just Domain\User

What version of the product are you using?
1.2.3

What version of Android are you running?
2.2.1

What version of Exchange are you connecting to?
MS Exchange 2007

Please provide any additional information below.
On my work environment we are only able to login to exchange using our UPN 
login.

Original issue reported on code.google.com by ilir...@gmail.com on 14 Apr 2011 at 1:43

[GoogleCodeExporter]

Hi there

Thank you for your message. Are you unable to use the app with your current 
credentials? As in can you try entering your username as "\name@example.com" 
(no quotes). I do know that someone else had success using this method. Also do 
you know if you are using BPOS or Google Apps. Both of these servers support 
only UPN based logins, and I tested my app against both of these. See

http://code.google.com/p/corporateaddressbook/wiki/MicrosoftBPOS 
http://code.google.com/p/corporateaddressbook/wiki/GoogleApps

Again thank you for using my app and providing feedback.

Regards
Vivek

Original comment by viveki...@gmail.com on 15 Apr 2011 at 5:40

[GoogleCodeExporter]

Hi Vivek,

Your workaround works for Office 365, but I had already giving up on your app, 
when I stumbled upon this ticket.

Could you please fix it asap?

I suggest you allow userid's without a backslash \ if and only if the username 
contains an at-sign @.

Original comment by jjhab...@gmail.com on 26 Apr 2012 at 1:43