The default search in Outlook seems to be full text search, so it will find a bunch of irrelevant things, and there are a number of settings, it is very difficult to use, in fact, the main search can be customized to set up, can improve usability.
The first thing to do is display the search tools in the menu, select Files-Options, and choose Custom Ribbon from the Options menu.
Locate the custom Ribbon B option in the upper-right corner, which is a drop-down menu, and Drop-down selects the Tools tab option. Make sure the check box for the search tool is selected
Now there is the search tool this menu bar, fine search to use here, rather than the search function above the message
The first search tool, search location is able to specify a PST file search, general Outlook single data file is too large, the system will be slow, so often for artificial split, here you can specify which data file to search.
After the Advanced Find, you will find that Outlook is also good, support to the recipient, sender, subject, and other accurate search
Compared to the search results, now more accurate, and a single data file speed can also be, to remind you do not open the Win7 index and search services AH.