I hope the title isn't too confusing. I have a situation where a client has about 40 computers. The machines are left on most of the time. Outlook is open most of the time. If the Exchange (2010) server is rebooted when a client goes to look at e-mail they get a proxy error message and are asked to log in again. This did not happen in the past (perhaps 7 months ago) but does now. This is not a big problem but users are accustomed to things being easy.
Is this a security feature that worked its way in or is this a fixable problem?