As of November 9th, Microsoft has started upgrading all Windows Live Messenger users not running the latest release of the instant messaging client to version 14 full build string 14.0.8089.726. From the volume of comments on forums and various blogs including the official Windows Live Messenger blog, it is painfully obvious that users are not happy with Microsoft’s decision to force them to upgrade. Mandatory upgrades to Windows Live Messenger 14.0.8089.726 are the only way for users of versions 8.1, 8.5 and 14 (with the exception of 14.0.8089.726) to continue being able to sign in.
Now there is a very simple workaround to the mandatory Windows Live Messenger 14.0.8089.726. But first, I actually advise users to upgrade. I know that a forced upgrade to Windows Live Messenger 14.0.8089.726 might not be exactly a move to warm up to, but from a security perspective it makes perfect sense.
It’s very simple, and the key is the operating systems supported by Windows Live Messenger 14.0.8089.726: Windows XP with Service Pack 2 (32-bit edition only), Windows Vista (32-bit or 64-bit editions), Windows 7 (32-bit or 64-bit editions), or Windows Server 2008.
You don’t see Windows 2000 anywhere on the list do you? First of all, make sure that Windows Live Messenger 8.5 is turned off completely – kill the process if you have to. For the next step, right click the Windows Live Messenger 8.5 icon and select Properties. Then go to the Compatibility tab, and choose to “Run this program in compatibility mode for” Windows 2000. And that’s it! Now Windows Live Messenger 8.5 will sign in without any issues.
Hack/Patch/Workaround for Forced Upgrades to Windows Live Messenger 14.0.8089.726 ? Continue Using Windows Live Messenger (WLM) 8.5 at CodenameWindows