What do i need to be aware of before i change the password on my exchange service account?

What do i need to be aware of before i change the password on my exchange service account?
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Exchange services should use LocalSystem.  This is necessary for a variety of reasons.

See http://support.microsoft.com/kb/239762.

Running with other accounts isn't supported.
omen1280Author Commented:
I get that but as for changing the service account i need to know what impact that will have on my exchange enviroment if any?
I do see an option to set the service account password if right click on the adminsitrative group and choose properties.
Do i have to change it anywhere else?

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Windows Server 2003

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