We will use Wednesday mornings for performing non-critical updates on the OMERO server. Usually the amount of time the server will be down will be just a few minutes. Operations like imports will fail and have to be run again. Otherwise, browsing of images will simply fail for the duration of the outage. If you plan on needing access to the server during the maintenance window please contact us at IMC-SUPPORT@LISTSERV.MED.HARVARD.EDU and we try to reschedule any updates we need to do to a more convenient time.