Recently had a client with Office 365 trying to Cache a Shared Mailbox. Outlook brought up a load of Sync Errors
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.
If the server is self hosted you can remove the restriction via : http://henrysluiman.blogspot.com.au/2013/02/how-to-increase-number-of-open-items.html
Microsoft fix for this is removed the Cache! https://support.microsoft.com/en-us/help/3115602/performance-problems-when-you-try-to-access-folders-in-a-secondary-mai
After rebuilding the OST and Profile and still no luck I started Outlook in Safemode which enabled the downloading of the emails
Once downloaded I could start Outlook Normally and all worked fine
Tags: Cache Mode, Download Shared Mailbox, Office 365, Outlook 2016, Try closing messages you have opened or removing attachments and images from unsent messages you are composing., Your server administrator has limited the number of items you can open simultaneously
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