searching email files

I archive all my mail in DTPO. Now I want to focus on mail from a certain year. I search with:

(Date: [0-9]) BEFORE/2 2013

to get my mail of the year 2013. Date line looks like:

Date: 	 9 september 2013 16:57:13 Midden-Europese zomertijd 

Is this the way to go, or are there other features in DTPO to assist with mail mining where I want to focus on To/From/Data/etc data?

When I do a select All, after this search, I get a spinning wheel for quite some time before the number shows. Is there a count like operator with searches?