My thunderbird with default settings does not replace tabs with spaces.
Perhaps the difference between outlook and thunderbird has to do with
the method of connecting? On thunderbird you probably use IMAP to get
your email from exchange, the IMAP system is horrible on exchange.
I suspect it has to do with the implementation of rules regarding
spaces. The conformance documentation [1] of MS does not detail this
sufficiently, but I am pretty sure that if you use an alternate mail
client you will see the spaces replaced also when connecting through IMAP.
[1] http://msdn.microsoft.com/en-us/library/ee624585%28v=EXCHG.80%29.aspx
Wouter
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