This Critical Warning is returned during mail sync with MAgE. This Critical Warning can be thrown for any folder name in a mailbox containing any number of messages.
2018-04-09 15:44:00.0177 Px1954 Tx2B A88 C20 M8325 Critical Warning Folder 'Sent Items' containing 14505 messages has not been processed completely. 136 messages have not been processed yet and for 0 messages whose processing failed there are pending retry attempts.
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