Has Office 365 been playing up last week?

I am a systems admin for a small business. I have had a lot of experience with Exchange, however this company has its email hosted with an Office 365 E2 plan, which I have not had exposure to in the past.

Last week I was tasked with changing a few user passwords. Seemed a simple request, just go in via the web interface, change it there, and then make the same changes on each user's Outlook 2010 client. The local AD is NOT federated.

Odd thing was, that the password changes did not "take" right away. In the first case I tried changing a second time, in another, I had the new password emailed to me. It took a random amount of time before each client popped up a requested for a new password. I was quite definite that I had changed a password, I had the email confirmation in front of me, and watched mail still being received without the credentials being changed.

The time seemed to vary between 2 and 24 hours after which each client needed the new credentials typed in.

This seems a HUGE security screwup; I would have expected a password change to happen almost right away.

Two questions:
1. Is this normal, expected behavior?
2. Did anyone else see something similar, around Wed 2-Sep?
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Mal OsborneAlpha GeekAsked:
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Vasil Michev (MVP)Commented:
Yes, it is the expected behavior. It's because of caching done on IIS side, token lifetime and whatnot. If this didnt happen in the first place, you would have to provide credentials for every action you take in Outlook. You can find more info for example in this article: http://blogs.technet.com/b/messaging_with_communications/archive/2012/06/27/part-ii-outlook-amp-owa-disabled-accounts-and-users-still-being-able-to-access.aspx

For the same reasons, disabling the account will not immediately have effect. If the goal is to prevent user from accessing the service, changing the password or disabling the account will not do the trick.

In addition, Outlook uses Basic auth when connected to EO, so it will cache the credentials in Credentials manager. Make sure to delete/update the credentials there as well.
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Mal OsborneAlpha GeekAuthor Commented:
So, 24 hours is "normal"?
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Vasil Michev (MVP)Commented:
You said it yourself, it varies.
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