Microsoft has plans to once again expand where Windows Phone-based apps are sold around the world. Today, the Windows Phone Developers blog site posted up word that Microsoft will offer the Windows Phone Marketplace to an additional 23 countries, bringing the total of countries that support the download store to 63.

The new countries that will be added in the near future are Bahrain, Bulgaria, China, Costa Rica, Croatia, Estonia, Iceland, Iraq, Israel, Kazakhstan, Latvia, Lithuania, Qatar, Romania, Saudi Arabia, Slovakia, Slovenia, Thailand, Turkey, UAE, Ukraine, Venezuela and Vietnam. Microsoft previously added Argentina, Indonesia, Malaysia, Peru and the Philippines for Windows Phone Marketplace support earlier in February.

Microsoft's Joe Belifore states in the new blog update:

In terms of actual potential app customers, the addition of new price points and customers in China and the other new markets represents a near 60 (percent) increase in the total addressable market for Windows Phone.

He adds that Microsoft has seen a massive 300 percent increase in the number of apps that are published on Windows Phone Marketplace every day.

As we previously reported, Microsoft has now released a new test SDK for Windows Phone developers that will allow them to set their apps that are designed to run on Windows Phones with just on 256 MB of RAM.