Configuring MS Exchange server 5.5

Your question is posted on the Outlook forum, though it seems that it should be posted in the NT/Exchange/BackOffice group.  I'll answer yuour question like this:

1)  I assume you are talking about POP3 email, since all of the Exchange server email is already on the server, unless you download it elsewhere.  So, under Accounts (or services if using an older version of Outlook), go into teh Properties section and select 'Leave copy of mail on server' from the 3rd tab.

2)  "Limits"?  what limits?  Mailbox size, download size, etc.?  The only setting you can control directly in Outlook (again POP3 only) is teh download size of an attachment.  You can restrict the download of an email if it exceeds a certain size using the same procedure above, obviusly different checkbox.

So, there is the Outlook answer, though I suspect you'll get the answer you are looking for in the before mentioned forums.

I mean where in the server i can set the limits of the accouts (mailbox) and i want to keep the mails in the server without configuring it the clients.

And how can i do to keep the mails in the server without configuring the options in the clients.

You have to configure an Exchange server with Mailboxes for all your recipients.

There are necessarily some client configuration.  Namely, you must create and Outlook profile for your users so that it can communicate with the user's mailbox.  If you chose delivery to the Mailbox and mnot a Personal Folder on the user's computer, it will store mail and other items in the MAilbox on the server.

Is there a way to make a backup of the mails (in the server)

Of course, there are several ways.

Probably the most popular is a tape backup method.  At the simplest level, you can use NT Backup and a tape drive.  But, you probably want to invest in a more sophisticated, powerful solution, such as Veritas Backup Exec or Computer Associates ARCserve.  This will take care of all your archiving needs, even client machines

As well, I have heard of people relying on Microsoft's Exmerge utility to backup mailboxes on to a separate machine.  This utility creates Personal Folder (.pst) files from the mailboxes.  This way, you can restore individual mailboxes without risk or database corruption, which other backup methods are known to cause.  However, there is no way to automate this process as you would with backup software like ARCserve.  So, in the end, this might be more labor intensive.

A key part about backing up Exchange is that you have a a recovery strategy.  You can back up all you want, but if you don't know how to recover the data in an emergency, it does you no good.  Restoring an Exchange database can be tricky, but well documented in the Microsoft Knowledge Base and other sources.  So study and practice.

Of course, there are several ways.

Probably the most popular is a tape backup method.  At the simplest level, you can use NT Backup and a tape drive.  But, you probably want to invest in a more sophisticated, powerful solution, such as Veritas Backup Exec or Computer Associates ARCserve.  This will take care of all your archiving needs, even client machines

As well, I have heard of people relying on Microsoft's Exmerge utility to backup mailboxes on to a separate machine.  This utility creates Personal Folder (.pst) files from the mailboxes.  This way, you can restore individual mailboxes without risk or database corruption, which other backup methods are known to cause.  However, there is no way to automate this process as you would with backup software like ARCserve.  So, in the end, this might be more labor intensive.

A key part about backing up Exchange is that you have a a recovery strategy.  You can back up all you want, but if you don't know how to recover the data in an emergency, it does you no good.  Restoring an Exchange database can be tricky, but well documented in the Microsoft Knowledge Base and other sources.  So study and practice.

Another question.
How can i do to view the mails in the server?.
I mean i want a report (who sent a mail, who recive one, time, etc).

thanks a lot.

All this stuff can be logged in the NT Event Viewer.  But, I'm not going to tell you how to set the logging level for each of these events.  You should really get a good book on Exchange server.  Or, take a online course at www.headlight.com.  It seems like you have a lot of curiosity on getting good at Exchange.