What will happen to my mail if I downgrade to Leopard?

I've reached my limit of crashes I can handle in snow leopard and am going to revert to Leopard.
What if any issues will there be with mail (and address book) when I do this?
Anyone made the move back? was it pretty simple?
thanks,
tom

Tom,
First let me say that I have had no such crashing experience with Mail 4.x, and I have 15 different accounts, including Gmail, MobileMe, Hotmail, hosted IMAP accounts, etc. Thus I have had no need to try this, and furthermore I maintained Leopard clones to allow me to use it at anytime.
However, there are few differences in the structure of the Mail folder, and I think you should be able to copy and use the com.apple.mail.plist file and the Mail folder (Home/Library/Preferences and Home/Library locations respectively) in Leopard. Only change I have noted is that xxxx.mbox folders in POP account folders have an Attachments folder that is not used in Mail 3.x.
You should check some of the topics about RSS and Mail -- that seems to be a source of problems for some.
Ernie

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