Vista

Even though the hotfix refers to WiMax connections having trouble renewing DHCP client leases, I have seen this exact behavior within network traces using my Novatel U720 USB EVDO modem that is connected to my home's Forefront TMG server. For those that don't know, Forefront Threat Management Gateway is the 'renamed' ISA Server which is part of the Forefront "Stirling" release (Forefront v.Next).

Since my Forefront TMG server is Server 2008 based, it would make sense that this hotfix should help the inconsistent/quirky behavior after maintaining a connection for 24 hours. At that point, DHCP attempts to renew and 9 times out of a 10, goes into a "coma" and stays "stuck" in the "connecting" state.

I can work around that bug by disabling the NDIS support on the U720 and using a 'normal' PPP connection, but that comes with its own set of limitations, especially if I want to do multi-ISP bonding or any of the other fancy features that being in NDIS mode enables.

If you have had trouble with Vista/Server 2008 renewing DHCP leases on WiMax/3G connections, request and try out KB 955352.

The cause:
"This problem occurs because the Windows Vista-based DHCP client computer does not comply with RFC2131 when the client computer tries to renew an IP address that was previously used. When a DHCPNACK packet is received from the DHCP server, the client must invalidate its previous configuration for the interface. Then, the client must return to the initial state to start the renew process."

Exchange System Manager for Exchange Server 2003 running on the Windows Vista operating system.

Known Issues
SMTP current session node is not supported (SMTPadmin.dll cannot be registered).
NNTP property view is not supported (NNTPadmin.dll cannot be registered).
Installing Exchange System Manager on the same computer as Microsoft Office Outlook is not supported, because MAPI CDO cannot be installed.

You may encounter the following issues during uninstall:
If Exchange System Manager is open during the uninstall process, Microsoft Management Console (MMC) is likely to crash. To resolve this, manually close the Exchange System Manager.
If the MAPI CDO package was uninstalled manually before uninstalling the Exchange System Manager, a runtime error may appear. This error can be ignored and the uninstall process will complete successfully.

Download here.