exchange server maintenance

Iwas reading in the link below about exchange server maintenance:
http://searchexchange.techtarget.com/tip/0,289483,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.
OR
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.

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

http://technet.microsoft.com/en-us/library/aa996226(EXCHG.65).aspx

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