How to view all unread mails in gmail

For many of us, we have a hard time keeping our mailbox to 0 unread mails.
The worst part is that once is a while if you try to filter by the unread mails, gmail doesn't provide this option out of the box. Because of this you would have some unread mails stuck up from the past which is not easily navagatable by the paging option.

But once you know the command to filter by its an easy task to filter by unread mails and see all the unread mails.

The trick is to search by the label "unread". For this, in the search box type the following:
label:unread
This would filter out all the unread mails in your mailbox. You can also use combination searches; for instance if you want to seach all unread mails from your inbox you can type in the search box as:
in:inbox label:unread

There are many more search options google provide, but not out of the box via the user interface.

Happy cleaning up your gmail mailbox.

What is the difference between Windows 8 Pro and Windows 8 Pro Pack

To keep it simple, Windows 8 Pro Pack is a subset of Windows 8 Pro.

Windows 8 Pro= Windows 8 + Windows 8 Pro Pack

Windows 8 Pro Pack is actually an add on package which contains softwares like Windows Media Center. It is a separate package because Windows 8 by default doesn't have Media Center. So after installing Windows 8 you will have to download and install Windows 8 Pro Pack to get media Center.
For a limited time (Jan 31 2013), you can download Windows 8 Pro Pack for free from the microsoft site. It si called Feature pack. Here is the link: Download Windows 8 Pro Pack (Feature Pack)

Note: Initially Microsoft had mentioned that Media center would come built in with Windows 8. But later they changed plans because of changes in codec licensing charges and other business scenario changes.