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https://knowledge-base.havit.cz/2013/08/01/outlookexchange-your-server-administrator-has-limited-the-number-of-items-you-can-open-simultaneously-try-closing-messages-or-removing-attachments-and-images-from-unsent-messages-you-are-composin/
Outlook+Exchange: "Your server administrator has limited the number of items you can open simultaneously. Try closing messages or removing attachments and images from unsent messages you are composing."