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Allocates a memory buffer.
Client applications and service providers
During MAPIAllocateBuffer call processing, the calling implementation acquires a block of memory from the operating system. The memory buffer is allocated on an even-numbered byte address. On platforms where long integer access is more efficient, the operating system allocates the buffer on an address whose size in bytes is a multiple of four.
Calling the MAPIFreeBuffer function releases the memory buffer allocated by MAPIAllocateBuffer, by calling the MAPIAllocateMore function and any buffers linked to it, when the memory is no longer needed.