Windows Phone 7 users have been waiting four months (and counting) for the first update to their phones’ OS, all presumably hoping not to make it to five.  And if a new piece of information proves correct, Microsoft will release that update just before the five month mark – by the end of March.

Microsoft news maven Mary-Joe Foley reports that  French web site FRogz.fr believes the first Windows Phone 7 update – aka NoDo – will be made available to users sometime in the second half of this month.  Her own sources confirm, saying that a day in the week of March 21st is the latest target date. 

Of course, if March passes without NoDo, it won’t come as much of a surprise to users who’ve been anxiously awaiting copy/paste, improved Marketplace searches and general fixes since late October; several reported release dates have come and gone – the latest being March 8th – without so much as a transmitted byte.  

But Microsoft is facing a bit of a brick wall here, as Verizon and Sprint are expected to release Windows Phones soon, and NoDo is reportedly required for CDMA compatibility.

Considering Windows Phone up ‘til now, though, wouldn’t it be fitting if the update arrived on April 1st?  Just sayin’…