Are records in a PST file stored in as contiguous blocks?

Question

Let's assume a PST with the following structure:

Inbox:

• msg1
• msg2

Draft:

• msg3
• msg4

can I assume that msg1 & msg2 are stored next to each other and msg3 & msg4 are stored next to each other?

Answer 1

No, you cannot assume that - PST provider reuses free blocks.