Hi,

Yes a Clean install does start things fresh but you will have the issues of 
re-inputting all serial numbers, pass-coes and such.  Depending on the number 
of apps and such that you have on your Mac, this may or may not be a factor.

If your SL system is running fine though, I would say that an upgrade will 
behave just as well as the clean install.  I have performed hundreds of upgrade 
installs with no negative effects in the upgraded OS.

Remember, as well, that the Clean install, then use of Migration Assistant is 
more or less the same process as the Upgrade.  So if you truly wish the Clean 
install, you'll need to re-serialize, re-preference set and re-enter pass-code  
info for all necessary apps.

In the end, it is basically your own comfort.

Later...

Tim Kilburn
Fort McMurray, AB Canada

On 2012-12-07, at 8:18 AM, Mike Arrigo <n0...@charter.net> wrote:

> Some may disagree with me on this, but it's my opinion that any time you 
> install a new release of an operating system, whether the mac, windows, or 
> anything else, it's always best to do a clean install. Not only does this 
> give your system a fresh start, but it also clears out any left over clutter.
> Original message:
>> Hello folks.
>> At the moment I am running Snow Leopard. I have just purchased Mountain 
>> Lion, but have not installed it as yet. I have created a bootable flash 
>> drive. I am very undecided on weather to go for a clean install or just 
>> install it over Snow Leopard. Any advice from those of you who have taken 
>> both paths would be much appreciated.
>> My system is in good condition, so I am very tempted to take the easy way 
>> out and install over my existing tried and trusted Snow Leopard. If I do, is 
>> there anything I need to look out for?
>> Martin --
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