When you are in Windows you can search for (only) Outlook items from the Start menu or Windows Explorer by restricting the search to Outlook message stores using
store:mapi
Search by item type
To limit the search to a specific Outlook item type, use
kind:email
kind:tasks
kind:notes
kind:journal
kind:meetings
kind:contacts
Note: The following will work in either Windows Desktop Search or Outlook’s Instant Search
Search by Field Name
In most cases, you can type the Outlook field name (leave out the space in multiple-word field names):
from:john
firstname:mary
Search by Date
To search between two dates use the following format with any date field:
received:(>1/15/2010 AND <4/15/2010)
To include results from the dates, add an equal sign or use two periods between the dates:
received:(>=1/15/2010 AND <=4/15/2010)
received: (1/15/10..6/15/10)
Search by Item Size
To find messages of a certain size or within a size range use the greater then, less than, and equal signs or two periods:
size:10kb
size:=50KB<60kb
size:3mb..12mb
Operators
In addition to greater than (>), less than (<), and equal symbols (=), you can use comma's, AND, or OR between search terms.
from:(mary NOT smith)
cc:(mary AND sue)
to:(mary OR billy)
Natural Language
Search recognizes days of the week (Sunday, Monday, Tuesday), the months (March, April, May) as well as today, tomorrow, yesterday, week, next month, last week, past month, and coming year. You don’t even need to use the space: thisweek, nextmonth, lastweek, pastmonth, comingyear are valid in Instant Search.

