I will try and cover most of the bases.
First thing is to check that you have the correct View setting for all your folders: View->Current view->Define views...->'Show all messages' [select]->Apply View... [button]->'All of my folders' [select]->OK [button]->OK [button].
Now look in the 'All e-mail' Quick view to see if your e-mails are listed there.
Also look for a folder called 'Recovered items' under 'Storage folders'. Double-click to expand each subfolder of the 'Recovered items' folder to see if you can find your messages.
Failing that, you should locate your WLMail Message Store* and explore it to see if you can find your messages, and also your contacts. It should be obvious from the folder names where to look, although your e-mail account folder name will be shortened with a coded name.
Don't rename, delete, or move any messages/folders etc in the Message Store. If you find your messages, which will have coded file names, you can copy them to a folder, with appropriately named sub-folders, on your Desktop or elsewhere for safe keeping.
Messages can later be dragged onto your WLMail interface as a method of importing them if required. They will regain their proper names in WLMail. You can also copy your Message Store's 'Contacts' folder for safe keeping if you find your contacts.
Rather than go on with scenarios of what to do next (I need my sleep), I will leave it to you to let us know what you find, and if necessary we can go from there.
*Windows Live Mail's Message Store, in its default location, is a hidden folder, so ensure "Show hidden files and folders" is checked under Folder Options in Windows Explorer if you want to explore it.
To find the location of your Message Store, in WLMail, go to Tools->Options...->Advanced [tab]->Maintenance->Store Folder. The default locations are:
Vista: %localappdata%\Microsoft\Windows Live Mail
(C:\Users\<Windows user account>\AppData\Local\Microsoft\Windows Live Mail)
XP: %userprofile%\Local Settings\Application Data\Microsoft\Windows Live Mail
(C:\Documents and Settings\<windows user account>\Local Settings\Application Data\Microsoft\Windows Live Mail)
(Windows Vista Home Premium SP1 with Windows Live Mail 12.0.1606)
"There are more things in Heaven and earth, Horatio, than are dreamt of in your philosophy." - Shakespeare
"Mitch" <Mitch@xxxxxx> wrote in message news:0F5B0764-2490-4481-88A2-E033166CA8C7@xxxxxx
> Hi everyone!
> Yesterday I checked my mails, I had all of mails + all of my contacts, today
> I have checked my mails too, but I lost all my mails and all my contacts, the
> weird thing is I didn't do anything.
> Can you guys help me?
> I have a pop3@xxxxxx mailadres...