How can I count how many emails I get each day and how many email I send each day in Outlook 2010 (office 365) ?
Seems like a basic feature but I am unable to find it.
There is a free Message Statistics by Date report available that does exactly what you want. Just select the required folder(s) or the entire mailbox and it will show you the number of sent and received messages as well as their sizes.
DISCLAIMER: I recommend this tool because I'm one of the developers, so feel free to ask any further questions.