Issue
The Archive Shuttle Shortcut Process Module may log the following error:

2015-03-25 09:35:26Z|2576| 14|ERROR| b__8|Error while enumerating folders. Redemption.RDOFolder GetFolderFromID(System.String, System.Object, System.Object)
 Error in IMAPISession.OpenMsgStore: MAPI_E_FAILONEPROVIDER
 ulVersion: 0
 Error: Your server administrator has limited the number of items you can open simultaneously. Try closing messages you have opened or removing attachments and images from unsent messages you are composing.
 Component: Microsoft Exchange Information Store
 ulLowLevelError: 1246
 ulContext: 1354
 at Redemption.IRDOSession.GetFolderFromID(String EntryIDFolder, Object EntryIDStore, Object Flags)
 at ArchiveShuttle.Modules.ExchangeLibrary.FolderManagement.FolderEnumerator.EnumerateImpl(String folderEntryId, Boolean recursive, Action`1 folderCallback)
 at ArchiveShuttle.Modules.ExchangeLibrary.FolderManagement.FolderEnumerator.<>c__DisplayClasse.b__8()
 at Amib.Threading.Internal.WorkItemsGroupBase.<>c__DisplayClass1.b__0(Object param0)
 at Amib.Threading.Internal.WorkItem.ExecuteWorkItem()
 2015-03-25 09:35:26Z|2576| 14|ERROR| b__8|Error while enumerating folders. Redemption.RDOFolder GetFolderFromID(System.String, System.Object, System.Object)

 
Solution
The error indicates that the module hit one of the maximum connection limits for Exchange. This may happen when the module reaches the maximum number of open folders per mapi-session.
Decreasing EV Post Process Parallelism and EV Post Process Item Parallelism threads on the System configuration screen should help with the issue. Alternatively, the limits within Exchange can be increased. The limits and how to change them can be found on Microsoft Technet:
Exchange 2013
Exchange 2010
Exchange 2007

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