I have migrated approximately 500 accounts and 40 domains over to Google Apps for your Domain. Most of my clients use the IMAP protocol to access their email accounts. One of the issues that I have come across is an error on password that occurs after a few days, weeks or even months of use.
The user begins to get a password error on login. If the user reads the complete error, it will say something along the lines of "Error on Password; web login required." The cure is simple, log in to the gmail webmail site for your account. Once the user logs in, the problem goes away.
Most users have no idea how to do this, so we always setup their domain to have a simple webmail login using http://webmail.CLIENTDOMAIN.com, where CLIENTDOMAIN.com is their actual domain. But others have to use the standard Google login, which is http://www.google.com/a/CLIENTDOMAIN.com.
The other day I ran across this issue, but logging into the webmail didn't cure it. In fact, the problem persisted through logging-out, rebooting, logging in from another computer, and everything else we could think of to try. Finally I just reset the password on the account to a new password. That worked right away. It wasn't that we had the wrong password -- we couldn't have reset the password otherwise. Somehow Google just didn't like the old password.
Same thing happened to me yesterday. I had to change my password for imap to work to my google apps domain from my Mac OS X mail app and from my iphone. Thanks for your post. You pointed me in the right direction.
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