Exchange email suddenly stops working - password incorrect message

For the couple of months that I've had my iPhone, I have had email/contacts/calendar working fine through syncing with an Exchange server. Now it's suddenly stopped working, coming up with a 'password' incorrect message no matter how many times I input the correct password. I have tried deleting and reinstalling the email account, but the same problem arises. The username and server details are all exactly the same as those with which I initially set up the account.
One thing I have noticed is that when going back into the Account Info page on the iPhone, the password entry indicates 8 characters even though my exchange password has 10 characters, which I'm fully inputting each time.
I know that many people have experienced problems getting the Exchange up and running; I'm confused, though, that having had it working fine it should suddenly 'drop' the password for no apparent reason. Any advice would be appreciated!

This problem seems to have resolved itself - the fault was with the Exchange Server, apparently.

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