Scheduled Mosaic maintenance will start no earlier than end of business on Friday (5:00 p.m.) and will be completed no later than Monday morning (8:00 a.m.). Mosaic updates could impact services provided via the Mosaic platform. Information on potential outages will be posted directly to Mosaic Alerts.

Scheduled Systems and Network maintenance will be performed on Sunday between 6:00 a.m. and 12:00 p.m. Network maintenance could impact services such as software applications, servers, voice, video and data communications, local area networks (LAN), wide area networks (WAN), wireless networking (WLAN), Internet, and ORION.

UTS will notify the campus community of anticipated impacts in advance of scheduled maintenance windows via the McMaster IT Systems Dashboard. Please note that these windows are subject to change in order to accommodate University activities. Critical business and learning periods will be avoided, where possible.

The following dates and times have been scheduled for the 2025 calendar year:

Month	Monthly Mosaic Maintenance Dates (From Friday at 5:00 p.m. – Monday at 8:00 a.m.)	Systems & Network Maintenance Dates (Sundays between 6:00 a.m. and 12:00 p.m.)
January	17–20	19
February	21–24	2 & 23
March	21–24	9 & 23
April	18–21	6 & 20
May	23–26	11 & 25
June	18–21	8 & 22
July	19 – 20	6 & 20
August	22–25	10 & 24
September	19–22	7 & 21
October	17–20	5 & 19
November	14–17	2 & 16
December	12–15	14