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Event ID: 5001 Source: MSExchangeMid-TierStorage

Multiple errors occurred while saving items for mailbox ''. The error was encountered 12 times on this session with the client information: .
From a support forum: "The error is basically saying that there were some errors when attempting a Copy On Write operation on a mailbox. Copy On Write is used to move the original copy of an item to the Recoverable items folder when the item is changed by an end user. If you're getting this warning, the operation is encountering some issues, more than likely latency. I've seen some other questions on this that suggest the error can be ignored unless it's accompanied by system failures or error/critical events on the logs on your exchange servers."
This event appeared every 15 minutes in application log: One mailboxes "Recoverable Items" folder plus its subfolder "Deletions" together had over 600.000 Items possibly because of the iOS 6.1/6.1.1 bug. After cleaning the warning disappeared. Instructions can be found here: EV100401 (Exchange 2010 Recoverable Items folder TotalDeletedItemsSize issue).

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