Yes! If you currently have a Pobox Basic or Pobox Plus account, just upgrade to Mailstore, and you can have your Inbox with Pobox. We have webmail, or you can use your favorite email application (like Outlook or Mail) to access your mail using POP or IMAP.
If you have a Mailstore account, you already do (or, at least, you can.) Go to the Home page. If you see "your mailstore account" as one of your forwarding addresses, you're already delivering mail to your Pobox Inbox. Now, you just need to get instructions on how to use Pobox with your favorite email program.
If none of your forwarding addresses are "your mailstore account", just click "Edit this Delivery Group" under the forwarding address group you'd like to add it to. There, you will see a link to "Send to my mailstore account". Click the link, and mail to those aliases will now be sent to your Pobox Inbox. Then, get instructions on how to use Pobox with your favorite email program.