I received an email with an html attachment, when I tried to open the document in outlook 2007, all of the contents in the document is not showing.

if you have been using MS Outlook app for your email, the file extension is either .OST for a personal mailbox or .PST for a mail archive. If you search for either of those terms you should be able to narrow down your search. If it is your personal mailbox, it will be called outlook.ost.
Your OST file is usually located at C:\ Documents and Settings\ username\ Local Settings\ Application Data\ Microsoft\ Outlook\ outlook.ost.

With the Web-based Yahoo! Mail service, you can attach to your email message a saved Web page or another document in HyperText Markup Language format.
When you attach an HTML file in this way, Yahoo! Mail won't display the HTML content of the attached file in the email message body.
To view the attachment, you must click the attachment tab above the email message.Yahoo! Mail and HTML
Yahoo! Mail is a Web-based service and it's fully compatible with the coding languages used to design and display Web content, including HTML and XML, Extensible Markup Language.
This means emails sent or received in Rich text or HTML format include clickable hyperlinks, graphics and other Web design elements.
However, Yahoo! handles emails with HTML attachments in a different way to email messages formatted with HTML.

About Yahoo! Mail Attachments
Like most email programs and online services, Yahoo! Mail offers an attachment feature for adding images, video clips, audio files and HTML document to email messages.
Some email programs display the content of the attached file in the email message body, but Yahoo! Mail doesn't provide this feature for any file attachment, whether it's an image, video clip or HTML document.


Viewing Yahoo! Mail Attachments When you attach an HTML document or another file to your Yahoo! Mail message, an "Attachments" button labeled with a "Paperclip" icon appears below the email address fields and above the email message body.
Clicking the "Attachments" button opens a pane containing a list of all files attached to the email. The email sender or recipient can open each attachment to view the files by clicking the file name.

Considerations

When sending a Yahoo! Mail with an attachment, always explain the content of the attachment in the main body of the email message.
A brief explanation will encourage the recipient to click and open the attachment to view the HTML document.
Bear in mind that many email services automatically block HTML attachments because of the security risk of opening HTML files, which can contain viruses, phishing scams or open Web pages with inappropriate content.
If you want to share a favorite Web page with a friend or contact, include a hyperlink to the Web page rather than a saved copy as an HTML attachment.

When you open the email to which the document is attached, right click on the attachment and save it to your desktop and work on it from there.

When you are completed, create a new email to send it back to yourself and do the same thing when you get the document back to work.

If you are using Outlook, attachments will often be saved here:
C:\Documents and Settings\Local Settings\Temporary Internet Files\Content.Outlook

It will be a hidden folder, but you can copy and paste that path into your Windows Explorer window's address line.

Have you check your security program?

It might be the one blocking the email content.

If you are unable to open any attached file in your incoming mail and are using Microsoft Office 2007, run registry editor (regedit.exe) and scroll to the following location:

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security

Copy the contents of the "OutlookSecureTempFolder" key and paste it in the Windows Explorer to open the OutlookSecureTempFolder. Delete all files in this folder and then run Outlook.

This location can not be browsed to and can only be found from the registry as it is different for all users. e.g. for myself it is as follows:

D:\Users\keekus\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\R34DKK8O\

For earlier versions of Microsoft Office, you may find the "OutlookSecureTempFolder" in these locations:

HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security

or

HKEY_CURRENT_USER\Software\Microsoft\Office\10\Outlook\Security

Outlook has bad memory management, and this happens often. The only way to relieve this is to save the attachments to your computer harddrive first, and then open it, instead of opening it from the email directly.

Its a pain, but its the cost of using Microsoft products.

If you still have this problem and are using Microsoft Office 2007, run registry editor (regedit.exe) and scroll to the following location:

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security

Copy the contents of the "OutlookSecureTempFolder" key and paste it in the Windows Explorer to open the OutlookSecureTempFolder. Your file will most probably be here. This location can not be browsed to and can only be found from the registry as it is different for all users. e.g. for myself it is as follows:

D:\Users\keekus\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.Outlook\R34DKK8O\

It looks like animations are blocked globally in Outlook 2007, but to get around it and seen the animations you can open the message, then on the Message tab, select Other Actions in the Actions group and select View in Browser. This may pop up a warning message that dangerous content may not be blocked due to a difference in security setting for your Internet Options and Outlook 2007. If you trust the sender, it should be okay. Outlook will create a temporary HTML file for your default browser to open and the animations should work inside of this environment.

Have you tried the repair option in Outlook? From the help menu, you can choose Detech and Repair. Also, you can choose to repair all of Microsoft Office from the Control Panel, Add and Remove Programs, find Microsoft Office, and click change. Then You can choose to repair.

They need InfoPath. It is just the same as you need Word to open an attached Word document