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What makes a mailbox big?
The size and quantity of the messages inside the folders.
The Navigation Pane.
Only messages with attachments.
When you delete messages to reduce the size of your mailbox, you'll also need to remember to do this:
Restart your computer.
Empty the Deleted Items folder.
It's possible to check mailbox size from Mailbox Cleanup.
RSS Subscriptions can cause bulk. What's an easy, automatic solution?
Don't subscribe to feeds.
Use AutoArchive to delete the feed items.
Use the Empty Deleted Items check box.