Issue
The Archive Shuttle Shortcut Process Module may log the following error while removing shortcuts in Office 365 mailbox:

2016-01-21 15:00:51Z|9044| 54|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation@onmicrosoft.com].
2016-01-21 15:00:52Z|9044| 53|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation1@onmicrosoft.com].
2016-01-21 15:00:53Z|9044| 42|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation2@onmicrosoft.com].
2016-01-21 15:00:53Z|9044| 35|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation3@onmicrosoft.com].
2016-01-21 15:00:54Z|9044| 26|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation4@onmicrosoft.com].
2016-01-21 15:00:55Z|9044| 39|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation5@onmicrosoft.com].
2016-01-21 15:00:56Z|9044| 35|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation6@.nmicrosoft.com].
2016-01-21 15:00:56Z|9044| 53|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation7@onmicrosoft.com].
2016-01-21 15:00:57Z|9044| 65|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation8@onmicrosoft.com].
2016-01-21 15:00:58Z|9044| 28|TRACE| CallService|[user.name@domain.com]: Executing action with credentials [impersonation9@onmicrosoft.com].
2016-01-21 15:01:00Z|5820|156|ERROR| SearchCollectionResult|[user.name@domain.com]: Search error Void CallService(System.Action`3
[Microsoft.Exchange.WebServices.Data.ExchangeService,QUADROtech.ExchangeWebServices.Interfaces.ICallServiceInfo,System.Object], System.String, System.Object)
 Too many concurrent connections opened., Microsoft.Exchange.Data.Storage.TooManyObjectsOpenedException:
 Cannot open mailbox /o=ExchangeLabs/ou=Exchange Administrative Group/cn=Recipients/cn=User. --->
 Microsoft.Mapi.MapiExceptionSessionLimit: MapiExceptionSessionLimit: Unable to open message store. (hr=0x80040112, ec=1246)

Solution
When the Shortcut Process Module is using Office 365 configuration, it can use all the accounts stored in credentials editor to execute the commands, and at some point, it will return the “Too many concurrent connections opened” error.

Decrease the Shortcut Process Item Parallelism and Shortcut deletion maximum batch count. It may be set too high for the environment.
The following steps explain how to change this value:

  1. On the Archive Shuttle Configuration page, select System Configuration.
  2. Select the Shortcut Process Module.
  3. Decrease Shortcut Process Item Parallelism and Shortcut deletion maximum batch count on the Shortcut Process Module. To test it, you may set it to 1 to see if the command will be executed successfully.
  4. Save the new configuration and wait 3-5 minutes to have the new configuration applied. Or, you may restart the Shortcut Process Module.
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