iOS6 devices erroneously take ownership of meetings

One of the great benefits to running one of the world’s largest Exchange deployments is that we at Microsoft get to see all the things that our customers face on a daily basis. With the recent release of iOS6, we have noticed a marked increase in support calls due to meetings having the owner of the meeting changed (sometimes called “meeting hijacking”). Most instances reported to us to date involve users with delegates who first open a meeting request in Outlook and then act on that same meeting in iOS.

Meeting issues are a large part of the challenges that we know some organizations see with 3rd party devices (here is our list). Unfortunately the recent iOS update has exacerbated one of these issues. We wanted to let you know about this issue as well as let you know that we have discussed this issue with Apple. We are also looking at ways that we can continue to harden the Exchange infrastructure to protect our servers and service from poorly performing clients.

In the meantime we wanted to offer a few mitigation options:

  • Tell users not to take action on calendars on iOS We're not seeing this particular issue if users don't take action on their calendar items (for example, accept, delete or change meetings).

  • Switch iOS users to POP3/IMAP4 Another option is to switch users over to POP/IMAP connections. This will remove calendar and contacts functionality while allowing users to still use email (though the email may shift to pull from push while using these protocols).


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