I passed the 50,000 sent Email threshold in my personal inbox recently. What records I was able to keep go back to 1996 (unfortunately, everything before that got lost).|
Now, that doesn't count work Emails for instance, in my last 6.5 years at google, my sent box says I sent over 41,000 Emails. Looking at some incomplete records I have, I sent 918 Emails while at netapp (9 months), 613 Emails while at SGI (9 months), 13684 Emails at VA Linux (3 years).
So, for whatever that's worth, I sent a few more work Emails in the last 10 years than I sent personal Emails in the last 13 years, for a total of over a 100,000 Emails sent. Not bad :)