Outlook shared folders not updating
If the above steps still do not work, you can delete the "Send to Net Documents" folder and then restart Outlook (make sure there are no email messages left in this folder tree before you delete it).
The folder will automatically be re-created after restarting Outlook.
This is only effecting 1 user out of 5 and the other 4 aren't having any issues and all 5 machines are configured the same.
Q: What’s the impact of a user having lots of Shared calendars opened or just configured in his Outlook profile ?
So in conclusion, the calendar update (for cached mode) or calendar access (for online mode) occurs only when the user clicks on the calendar or switches from the “Mail” view to the “Calendars” view.
If you do not do this before sharing, the folders you share will remain inaccessible to those users.1.But if they uncheck the box beneath the shared calendar name, and don’t access it for a while, and then after 1 month they check the box beneath this shared calendar because they need to access it, Outlook will update the data with the data from the last month since last time they accessed it.Updates download of calendars is on access only when “Download Shared folders” is checked on Outlook (2010, 2013) As a summary, if the user has cached mode enabled, calendars will be updated when they will access the calendar, if users doesn’t have cached mode enabled, calendar connection will be on access only as well.Administrators can use the tools listed below to change the permissions on many mailboxes or folders at once.For more information about Exchange server permissions, see Managing Exchange Server Permissions In order to share Outlook subfolders with another user, you need to give them the desired permission (at least Reviewer) to the folder and at least Folder visible permission to every folder above the shared subfolder.