exchange server maintenance

Iwas reading in the link below about exchange server maintenance:,289483,sid43_gci1188647,00.html

I need someone to explain to me the 11 tasks, what they are? how  are they done by exchange?
example when it says :
Perform tombstone maintenance on mailboxes and public folders.
Clean up message conflicts within public folders.

It doesn't make any sense to me.
SO I need and expert in exchange to explain those tasks.

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The system performs those tasks, you do not need to do them yourself.
This link describes the tasks the system is performing, if that helps.


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