Outlook spams user with meeting invitations

Scenario:

1.

User A invites the whole organization to a meeting (950 employees).

2.

User B declines another invitation, whereafter Outlook sends out User A's invitation as if User B was the organizorThis has happened two times over the last three days. Both times with the same scenario and the same two people.

Bonus info: User A tried to add 15 people to the meeting and explicitly instructed Outlook to only send the update to the added persons. Outlook sends out to everyone anyway.

I have checked with User B's mailbox to get a picture of what's has happened and it seems as if he istelling the truth.

What's going on here?

/Kasper
Kasper KatzmannSeniorkonsulentAsked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
That will be it then.
If you look in Google for iOS Meeting Hijack you will find it was a very common problem, looks like it is back in 2012 though.
The user should either upgrade the iOS, or if that isn't possible, take the ActiveSync account off it.

Simon.
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SvenIACommented:
Check the Outlook permission of User B. There is a setting there called;

Delegate receives copies of meeting-related messages sent to me

Could that have something to do with it?
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Kasper KatzmannSeniorkonsulentAuthor Commented:
I have checked both users and this is what is set on their calendars:

FolderName   : Calender
User         : Default
AccessRights : {LimitedDetails}
Identity     : Default
IsValid      : True

FolderName   : Calender
User         : Anonymous
AccessRights : {None}
Identity     : Anonymous
IsValid      : True

FolderName   : Calender
User         : Clerc-DEPT
AccessRights : {Author}
Identity     : Clerc-DEPT
IsValid      : True

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SvenIACommented:
But what is configured in the Outlook cliĆ«nt? Tools > options > permissions (tab on the right)
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Simon Butler (Sembee)ConsultantCommented:
Are you sure there are no mobile devices involved?
This sounds like the problem with the Apple iOS implementation last year, which caused loads of problems with meeting management.

Simon.
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Kasper KatzmannSeniorkonsulentAuthor Commented:
SvenIA: It's the same. Any permissions you can see in Outlook, you can see with Powershell.
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Kasper KatzmannSeniorkonsulentAuthor Commented:
Simon: User B tells me that he has an old iPad 1 whit iOS 6.[something]
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Kasper KatzmannSeniorkonsulentAuthor Commented:
It's hard to recreate the problem without spamming the organization, but you suggestion sounds valid. I have instructed the user to remove the ActiveSync account from his iPad.

Thanks  :-)
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