Microsoft’s French PR team has confirmed that its first Windows Phone platform update will be released in the second half of March.
Microsoft CEO Steve Ballmer originally promised that “NoDo” would ship “in early March” at Mobile World Congress 2011. Ballmer also presented a slide that claimed the update would ship within the first two weeks of March:

Ballmer's Windows Phone update promise
We’re currently in the second week of March and it doesn’t appear that “NoDo” will be distributed this week. Microsoft was originally rumored to be shipping the update on March 8 but this date has since passed. On Wednesday, Microsoft France posted to its public-relations blog (FRogz.fr) a note claiming that NoDo will be coming in the second half of March 2011 according to ZDNet’s Mary Jo Foley. Microsoft is now believed to have pushed the update back to the week of March 21.
Despite the official no show, a number of Windows Phone 7 ROMs have leaked for various devices. The ROMs contain a final unbranded RTM build of “NoDo” ready to be flashed to devices. Windows Phone enthusiasts at XDA-developers posted a ROM image for European HTC 7 Mozart usersearlier on Tuesday. The ROM upgrades the devices to the final version of “NoDo” ahead of Microsoft’s release. The site has also supplied ROMs for HTC HD7 and HTC 7 Trophy owners. All three leaked ROMs are unbranded European versions, which do not include carrier customizations. Owners wishing to flash the leak updates will need to use a “Gold Card” method to bypass a “VENDER ID” error. The process is not ideal for the average user but those wishing to pursue unofficial methods can find the links above.
“NoDo” is Microsoft’s first platform update and will include copy and paste. Windows Phone 7 copy and paste has been demonstrated recently in full thanks to an unlocked emulator. Microsoft’s first update will also improve application start-up and resume times.
“NoDo”, the codename for Microsoft’s first Windows Phone 7 update, has been ready for some time. The software giant RTM’d the update in December and has been busy preparing the Zune client software and Marketplace to handle the updated software. The update has been delayed a number of times due to concerns from operators and device manufacturers.
Microsoft also posted a video demo of the “NoDo” update in action, see below.