*Update*

ITS has found the problem and there has been a brief outage connection to some users mail. The indexing problems will be fixed as the server tool that is currently running repairs them.


Previous Description (2014-09-17 09:35:48):

There is a problem with searching in the on-premise Exchange mail system.

Outlook users without cache mode settings and mail users using Outlook Web App (OWA) are unable to search.

ITS is investigating the problem.