All my old mail, sent mail and personal mail is deleted daily how do i retrieve those important things back

SOURCE: how can I retrieve sent email. I sent it to a

read this article - Regret that email? Gmail allows recall

SOURCE: Hi,

, If you have deleted your inbox mails, you will easily access back to them for they have reached the trash box. You will obtain it in the trash box. Yet if you have deleted them completely, it will be more complex

Testimonial: "Good"

SOURCE: I forgot my psswrd to gmail acct, and could not

In order to reset and change the password of Gmail and corresponding Google Account with the affected Gmail email address, follow these steps:

1. Go to https://mail.google.com/ (related: other Gmail URLs).
2. Click on I cannot access my account link.

Change Gmail and Google Account Password
3. Click on radio button of I forgot my password, and then click on password recovery page link (or you can go directly to the link above).
4. Enter the username for the Gmail or Google Account in the field provided.
5. Enter the captcha letters as shown in the image on screen.
6. If you never login to the Gmail for the previous 24 hours, a secret question as set in the Google Account will be presented. Answer the question with a correct answer in order to be able to reset the password.

If you're unable to answer your security question and the account has a secondary email address configured, a link will appear at the bottom of the secret question results page. Clicking on the link will has a password reset email message sent to the secondary email mailbox. After receiving the email, follow the link to reset the password.

If you have login to Gmail in the preceding 24 hours period, the password reset email will be sent immediately instead. Follow the link to reset the password. If you don't have a secondary email address, or if you no longer have access to that account, repeat the steps above after 5 days. At that point, you'll be able to reset your password by answering the security question you provided when you created your account.
7. If you cannot remember the answer to secret question, cannot answer the secret question correctly and do not receive password reset email in secondary email account, try to contact Google for help.

SOURCE: My Gmail account was recently hacked into by an unknown source.

I think your computer is infected ! Try to make a full scan with your antivirus ( you should update it first ). If you don't have one you can download a full free version of avast or get trial period for gdata or kaspersky.
Besides I suggest to go to your gmail parameters and choose to log in with https protocol by default. Change your password and secret question.

SOURCE: gmail sent mail in inbox

http://www.lytebyte.com/2009/08/11/guide-to-setup-gmail-imap-in-outlook-2010/ here is a way to do it for Outlook 2010
http://mail.google.com/support/bin/answer.py?answer=77689 here is google's way to do it for Outlook 2007
http://mail.google.com/support/bin/answer.py?answer=13278 here is google's way to do it for Outlook 2003
Hope this helps. I scrolled trough these tutorials, and they are safe to try.