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My biggest concern: I'll be going back to school (for my mba) and everybody is suggesting that I stick to using a PC since most universities don't *officially* support mac.

I believe I'm right in saying that Mac's are now more popular in University than PC and it's share is growing all the time.

Don't forget that Mac's are fully capable of running Windows, both natively and with a Parallels type application.

Recently, I again heard that I'd have problems connecting to an existing wireless network at school

Well, I'm fairly sure that's rubbish. Speak to the technology department at the Uni but I'm fairly sure that is nonsense.

I'm also told that when I use mail, others would receive certain files (that are totally blank and thus unnecessary) as attachments??

Are you getting this information from somebody that has never used a Mac and wants you to buy a PC by any chance?
 
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