Resource Booking Assistant crashes after you upgrade to Exchange Server 2013 Cumulative Update 5

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Symptoms

After you upgrade to Cumulative Update 5 for Microsoft Exchange Server 2013, the Resource Booking Assistant (RBA) crashes at two gigabytes (GB), and it cannot process on the resource room to accept the message on the mailbox.

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Cause

This issue occurs because too many instances of the Calendar Repair Assistant (CRA) are running on the server. This causes RBA to hit the memory limit and therefore crashes.

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Resolution

To resolve this issue, install Cumulative Update 7 for Exchange Server 2013.

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Workaround

To work around this issue, follow the instructions to limit the number of concurrent CRA threads to no more than five:

Under the Exchange installation path \Bin folder, open the MSExchangeMailboxAssistants.exe.config file.
Add the following key under the appsettings node:
<add key="Workload.CalendarRepairAssistant.MaxConcurrency" value="5"/>
Restart the Microsoft Exchange Mailbox Assistants service (MSExchangeMailboxAssistants).

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