Rapid transition guide from Exchange 2003 to Exchange 2010 Things that you need before and after you move to Exchange Server 2010 a free pdf can be downloaded here.

This is one of the best detailed article available on net for those who wants to go from Exchange Server 2003 to 2010.

This ebook contents from Check Existing Topologies to Uninstalling Exchange 2003 after successful installation of Exchange server 2010.

Adding IP Block List
An administrator can configure list of IP addresses that are known as sources of spam, malicious code/viruses or some untrustworthy sources.
To do this follow these steps:
1. Expand Server Configuration.
2. Select Hub Transport to display Hub Transport servers.
3. From the center panel, select the Hub Transport server to which you wish to add the IP address or range to be blocked.
4. Click the Anti-spam tab.
5. Select IP Block List.
6. From the Actions pane, click the Properties shortcut to display the properties pages (alternatively, right-click IP Block List to select Properties from the context-sensitive menu).
7. On the Blocked Addresses tab, click on the Add button.
8. You can also add a single IP address (for example, x.x.x.4) or a lists of IP addresses.
9. Also if you need you can set an expiration time for the entry. Connections from the IP address or range will be allowed after the expiration time. The dialog box displays the expiration time, if one is entered, and its current state—whether active or not.
10. Click OK twice to close the IP Block List properties.

Thats it, you are done…

Multilayered future of Exchange Server 2003 is enhanced in Exchange Server 2007. The included components are:

1. Connection Filtering agent,
2. Content Filter agent,
3. Sender ID agent,
4. Sender Filter agent,
5. Recipient Filter agent and
6. Protocol Analysis agent.

Anti-spam agents are installed on Exchange Server 2007 servers running the Edge Transport server role. These can be installed on Hub Transport servers using the installantispamagents.ps1 script. This can be found in the Scripts folder in the Exchange Server 2007 install
path (”C:\Program Files\Microsoft\Exchange Server\”).

You can use the Exchange Management Console to view who last logged on to a mailbox, last logon date and time, mailbox size, and message count by the following Steps:

The Same details are also can be obtained using Get-MailboxStatistics cmdlet.
To Do this:

Syntax
Get-MailboxStatistics [-Server 'Server' | -Identity 'Identity' | -Database 'Database']
Usage
Get-MailboxStatistics -Server ‘ServerName’ Get-MailboxStatistics -Database ‘ServerName\DB-Name Group\GroupName’
Get-MailboxStatistics -Identity ‘cpandl\NameOfTheUser’

There are two ways you can set users to change the password in next logon. This can be done from Exchange Management Console or Set-User cmdlet.
First lets see how to set user to change his password in next Logon.

• In Exchange Management Console, expand the Recipient Configuration node and then select the related Mailbox node.
• Double-click the mailbox entry for the user with which you want to work.
• On the Account tab, select the User Must Change Password At Next Logon check box. Click OK.

You can also use the Set-User cmdlet to perform the same task.

Syntax
Set-User -Identity ‘UserIdentity’
-ResetPasswordOnNextLogon <$false|$true>
Usage
SetUser -Identity ‘UserNameIsMrIndia’ -ResetPasswordOnNextLogon $true