Upgrade notes starting to appear in Messenger
It appears that the Messenger team is planning to introduce upgrade notes to all Messenger users soon. From today, 17 February 2009, onwards, the first notices will be appearing in the Messenger 2009 Beta version. Additionally, all users using the Messenger RC build (14.0.8050.1202) are asked to upgrade their Messenger version to the latest QFE build, just as previously announced (without telling any dates).
The next step will be upgrade notes appearing on the Messenger versions 8.1 and 8.5. Users of these versions will start to see notes from 25 Febuary 2009 onwards. The last bit will be started from mid of April, when all Messenger users see the upgrade notices on each sign-in. Microsoft is recommending to install the latest version because else some Messenger functions may not be working. For users of Messenger 2009 Beta (14.0.5027.0908), the upgrade is mandatory.

Mandatory upgrade: Messenger 14.0.5027.0908 forces users to install the 2009 Final
There is a new version of Messenger available. Download now
[...] Microsoft releases new messenger version <Date: 2009-02-22> <Author: Bram> <Category: Windows Live (Messenger)> Leave a comment Hello there! If you are new here, you might want to subscribe to the RSS feed for updates on this topic.Sorry for the late post, but we have been quite busy (noticed comments system? We’re still working on the DCAP and I got my own things too..), but better now than never: Microsoft has released a brand new version of Messenger 2009, build 2022: Messenger 2009 14.0.8064.206! Nothing new is in there, except for some bugfixes. Messenger Plus! Live has been reported to be compatible, as well as WLMStatus. Users of the old version do get notified using 3 ways: A toast, a popup and a yellow information bar. You can find screenshots of these on fellow-blogger mynetx’ blog, by clicking here. [...]