This post mainly serves as a reminder for myself, because after each reinstall of Windows I have to search for this all over again and it is not very easy to find.
By default the Windows Feeds Engine stores only a limited amount of items per feed (200). You can only increase this limit up to the predefined maximum of 2500.
If like me you like to preserve every blog entry made (or at least more than 2500 items per feed), you can increase this limit by creating the following registry DWORD value:
HKCU/HKLM\Software\Microsoft\Feeds\MaxItemCount
I usually set it to 0x7fffffff, which is the largest possible positive 32 bit integer you can set. Basically it means preserving every blog entry ever made for a specific blog.
Source: http://msdn.microsoft.com/en-us/library/ms685364(VS.85).aspx
Coding 4 Life 
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