Server Administrator has Limited the Number of Items You Can Open Simultaneously

Over the weekend, we moved all of our room mailboxes over to Exchange. For users who have lots of room calendars open in their Outlook clients, they are getting the error message "Cannot Open the free/busy information. You Server Administrator has Limited
the Number of Items You Can Open Simultaneously" after the migration from Exchange 2010.
Restarting the Outlook client temporary fixes the problem, but the problem comes back after they access the calendars again.
The users impacted deal with a lot of room scheduling, so they have 30+ room calendars open in their Outlook clients.
I have tried setting up a throttling policy with unlimited RCA connections, but that didn't help.
I have seen with Exchange 2010 there were some registry keys people were setting on the server that pretty much makes everybody have unlimited connections, but that isn't ideal if's only affecting a few people.

Hi,
Since this issue only occurs to a few users, I recommend you disable all the third-party applications on Windows, especially for the desktop search apps. Meanwhile, use Outlook safe mode to disable all the add-ins and check if the issue persists.
If the issue persists, you need to reset the value of Maximum Allowed Sessions Per User. Besides, we can't set it for only some specified users.
Here is a thread for your reference.
Event 9646, MSExchangeIS - Mapi session exceeded the maximum (Note: Though it is Exchange 2010, it also applies to Exchange 2013 about this issue)
https://social.technet.microsoft.com/Forums/exchange/en-US/91922b60-38b7-4af3-ba13-3b44949cc9f7/event-9646-msexchangeis-mapi-session-exceeded-the-maximum-exchange-2010-sp1-w-update-roll-up-2?forum=exchange2010
Hope this can be helpful.
Best regards,
If you have feedback for TechNet Subscriber Support, contact
[email protected]
Amy Wang
TechNet Community Support

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Server Administrator has Limited the Number of Items You Can Open Simultaneously

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