exchange doesn't accept my password

Hi Guys,
When i try to connect to an exchange server via outlook 2007, it keeps on asking me for my password continuously. I supply the password, but it keeps on asking me for it again.
It happens for all the mail accounts in my company.
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Outlook 2007 prompts you repeatedly for password under certain network conditions:

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Glen KnightCommented:
Are you using Exchange 2007?
If so there are a few reasons why this could happen.

Check out option 1 and 3 of my article here as a first step:

If you find the article useful please vote for it :)

Upgrading to Exchange 2007 SP2 fixes one issue that causes this, then there is also a security update that could cause this and you may need to modify the Kernel Mode Authentication
You may need to enter Domain\username.
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