November 15, 2012, 1:32 PM — Are old emails and ones with large attachments hogging up all your Gmail storage space? Have trouble finding the exact email message you want? Luckily, Google has added more ways to find what you're looking for and, perhaps, clean out those huge emails you no longer need.
To find emails larger than a specific size, use the larger: operator with the size of the email and K for KB and M for MB. For example, entering "larger:500M" will find all emails larger than 500MB. (You can also use the new size: operator, but then you have to specify the size in bytes, e.g., "size:500000000" for 500MB, which is a little more mentally challenging.)
If you want to find very small emails, you could use the smaller: operator similarly. (Though I'm not sure how useful that is.)
Find older or newer emails by using the older_than: and newer_than: operators. For example, if you enter "older_than:1y" Gmail will show you all messages older than 1 year (use "m" for months and "d" for days). To find emails received within the last 4 days, use "newer_than:4d".
Want to look for an email with a specific word in the message but not related words? Use the + (plus sign) operator. For example, if you search for "+universe" you'll get every email that contains "universe" but not those that have "universes" or "universal".
See the whole chart of Gmail advanced search operators here so you can find the emails you need (or no longer need) more accurately and quickly.