How many different email addresses are linked to your device? Obviously 12 would be the Max, but I have yet to meet the man/woman/child who has this many. With both my Personal and Business device, i have 11. (well i could create 4 more @carrier.blackberry.net but i really dont need/want to)
I have 7 on my BlackBerry -- a combination of personal and business, one dedicated to email lists. I have a few others, including a Yahoo account that I don't have on the BB, and a couple with my domain names that I check only via webmail every few days.
I check 3 accounts on my Blackberry, but I have a GMail account I only use on my home computer. That way, if I want to forward something home it won't come back to my Blackberry.
My hotmail account is strictly for online stuff that requires an email address, like online shopping. I also start folks I don't know too well with that account until I can bring them into my "inner circle of trust." Then they get the real stuff. I do have Excite and Yahoo accounts that I haven't used for years. They're just spam receptacles.