No, not really. You simply have the latest build of Messenger. Back in February, BillG sent out a company-wide email, saying he wanted better security in his software, so the Messenger team did it...and as a result, MID gives a script error (yes, it's the "better evil"). If you have build 73 somewhere, use that and ignore upgrade notices...the main security fix was for something rather inane, anyway. With the latest Messenger builds, you'll have to wait until the Windows team updates the MID server so that you can use it again. No idea when that will happen.
If you don't mind using an older version of Messenger (v4.5), it's located
here. Otherwise, I dunno where you can download v4.6 bld73...sorry.