VMWare server upgrade

I've been informed by the company that hosts the box running
developer.pgadmin.org and nagios.pgadmin.org that they will be upgrading
the OS to RHEL 4 Update 5 during one of the following maintenance windows:

    Start:  June 12, 2007 11:00 PM CDT
    End:  June 13, 2007 05:00 AM CDT

    Start:  June 13, 2007 11:00 PM CDT
    End:  June 14, 2007 05:00 AM CDT

    Start:  June 14, 2007 11:00 PM CDT
    End:  June 15, 2007 05:00 AM CDT

    Start:  June 15, 2007 11:00 PM CDT
    End:  June 16, 2007 05:00 AM CDT

    Start:  June 16, 2007 11:00 PM CDT
    End:  June 17, 2007 05:00 AM CDT

If either of those VMs seems to be down during these windows; you know
why :-)

Regards, Dave