Gartner Inc., a technology and research advisory company, has released it's first quarter 2010 numbers on smartphone sales and the numbers on Windows Mobile have declined a bit.

Compared to Q1 2009, Windows Phone sales dipped slightly from 3,738 units to 3,706 units (units in thousands). While Symbian has the largest percentage of the market at 44.3%, Microsoft is fifth on the list at 6.8%.  Symbian also tops the list in units sold with 24,069 units (again, in thousands).

In a similar report from IDC, another technology research center, has Nokia leading the market in smartphone vendors for Q1 2010 with 21.5 million units shipped. The only Windows Phone vendor in the top five was HTC who placed fourth moving 2.6 million units. There was no break down on how many of these units were Windows Phones or Android.

The decline in Windows Phone sales isn't all that surprising since new releases have been at a virtual stand still. We've seen only a handful of new phones, led by HTC's HD2 and Mini, while the Windows Phone transition builds up to the release of the Windows Phone 7.

All is not lost.  We are seeing more interesting news coming from the Windows Phone 7 development and the jury is still out on how successful the KIN will be.  It will be interesting to see how these two Windows Phones will affect these numbers.