If i upgrade to mountain lion, will I lose all my aftermarket software?

I just got an iPad 2 & now I need to upgrade my macbook pro to mountain lion so I can activate iCloud & share media between the two. I'm worried that if I do, I will lose all my aftermarket software on my macbook, most importantly 'office for mac' as I don't have it on disc and need it.
I was going to upgrade via the app store - can I do that without it affecting my other software?

Welcome to the Apple Support Communities
You won't lose anything upgrading Mac OS X. Note that Office 2004 isn't compatible with OS X Mountain Lion because it's a PowerPC application, so if you are using it, you have to upgrade to Office 2008 or 2011 first. Remember to make a Time Machine backup and/or a clone with Carbon Copy Cloner before upgrading

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