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Can't imagine how a change of the operating system could affect email delivery. After all servers at telkomsa.net have no idea what you run at home...
Do senders trying to contact you get any error messages ("message undeliverable" or similar)?
Assuming this is not the case, send (or ask somebody else to send) a message to you from another account and check your mailbox via the web interface from another computer. This will eliminate any possible misconfiguration of Win7 and/or Thunderbird on your system.
What I have in mind is a (remote) possibility that TB is set to delete (mark as spam??) all incoming messages locally and on the server, so every time you use it, it clears everything. Not very likely, but IMHO possible.
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