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Multiple Read Receipts are received after creating an Appointment

A user created a new Appointment in his Outlook 2010 calendar and sent an invitation to several other users. After getting a confirmation from the attendees, he received multiple Read Receipts from them as well.
The Read Receipts state, that the invitation message was deleted while it was unread.
The user had no configuration for Delivery or Read Receipts in Outlook.
Where do those receipts come from?

Exchange Server Version: Exchange Server 2010 SP1 RU1
Client Version: Outlook 2010
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thermoduric

8/22/2022 - Mon
Timothy McCartney

Does the user have an additional device that syncs with Outlook? Such as a smartphone? (Iphone, Android, Windows Mobile, Blackberry, etc) I recently encountered a situation where a user was receiving the same Read Receipts over and over but it turned out that the cause was her Iphone.
0441

ASKER
Yes, the user has a blackberry device.
Timothy McCartney

I'm not proficient in blackberries, but you may want to ensure there are no Read Receipt settings enabled on said device.
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James Murphy
0441

ASKER
The strange thing is, only the invitations were affected, no other mails.
Timothy McCartney

Hmm... I'll look through my outlook 2010 settings and see if there's something in there we could change. Is he continuously receiving the receipts?
0441

ASKER
No, not in the last few days.
It first occured after the Update Rollup 1 installation for Exchange.
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0441

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0441

ASKER
I was informed by Microsoft that this behaviour is a known bug.
This question should be closed now.
thermoduric

Starting the Auto-Close procedure on behalf of the asker.

Please see the Community Support Request for more details on why this action was taken.
https://www.experts-exchange.com/questions/26802577/09-Feb-11-09-Automated-Request-for-Review-Objection-to-Delete-Q-26618091.html

- thermoduric -
EE Community Support Moderator