GOexchange is an OFFLINE process which means that NO E-MAIL access will be available during the maintenance process. However, with Exchange 2013, 2010, 2007, 2003, 2000 and 5.5 The GOexchange maintenance process can be run on specific Stores without taking the entire system offline, therefore users homed in other Information Stores may continue working.

NOTE: GOexchange can notifies your users of the of the impending service outage and then automatically takes the designated information stores OFFLINE for maintenance and then will bring them back ONLINE once maintenance is complete and GOexchange will do the rest.