Answers

1. AutoArchive is on the Advanced tab underneath the Outlook start and exit headings. If you do not see this, it is probably due to your IT department in your organization not giving you the rights on the server to access this feature. Another reason for this is that you have an Exchange account, and online archiving has been enabled for you with automatic settings.
2. If your inbox is storing a lot of emails, usually because you never delete any messages, you will want to check the size of your folders. Click File | Folder | properties | Storage. If you have more than 2 GB of emails used, you need to archive some of your emails.
3. This message appears when your PST file has reached its maximum storage limit. To fix this, you can manage the mailbox size by clicking File | Info | Tools | Mailbox Cleanup….
4. Occasionally, your files may become corrupt in Outlook. To repair them, click File | Account Settings… | Select the account to repair | Repair…...