*Update*

All users should be able to execute searches within their mailboxes again.

Thank you for your patience.
IT Services.
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Previous Description (2014-08-12 09:35:12):

ITServices has identified an issue with mailboxes for some users on Queen's on-premise Exchange. The search capability is currently unavailable for these mailboxes.

ITServices is working to resolve the issue, but re-indexing is a time consuming process.

We will update this notification as more information becomes available.