About Hotmail Storage.
Windows Live Hotmail includes e‑mail storage that expands to provide you with as much storage space as you need. Your inbox capacity will automatically increase as you need more space.
If your inbox suddenly and abnormally skyrockets in size, you might get an e‑mail from Windows LiveHotmail asking you to slow down, move e‑mails from Hotmail to your desktop, or delete some old e‑mails. Please read these e‑mails and follow the advice provided in them to continue to enjoy ever-growing storage.
If your inbox grows too fast, you might not be able to receive any more messages. Here are some suggestions to help you manage your account so that it doesn't become too large:
Create an archive. Set up a folder on your computer's hard disk where you can save large attachments, and then delete them from your inbox.
Automatically delete junk e‑mail. Set up your Windows Live Hotmail account to delete unwanted, unsolicited, illicit, or spam e‑mail as soon as it comes in. To do this, click Options, and then click More options. Under Junk e‑mail, click Filters and reporting. Under Delete junk e‑mail, click Immediately, and then click Save.
Empty your Junk and Deleted message folders. To do this, click the folder you want to empty. On the toolbar, click Empty