The upgrade has now been postponed by (about) a week, due to ITS procedural issues. The work will now likely take place on the 12th, but details will be communicated soon.
Niels
The stack upgrade is now scheduled for Monday the 13th, starting at 8:30am, at which point the system will become unavailable. We expect work to be completed before noon.
Access should be restored later in the day using a new server at the same address, but the service should be considered at risk until the 14th.
Niels