Microsoft published Exchange Remote Connectivity Analyzer tool. It’s will help you test your Exchange connection from Internet.
The tool will allow you to remotely test the following services:
1. Microsoft Exchange ActiveSync Test
This test will simulate the steps a mobile device uses to connect to an Exchange Server using Exchange ActiveSync.
2. Microsoft Exchange ActiveSync AutoDiscover Test
This test [...]

Exchange Edge is using self-signed certificate for the SMTP services and for subscribe new Exchange synchronization between Hub and Edge servers.
Self-signed certificates are only valid for one year.
To display certificate used by Exchange Server run this command:
Get-ExchangeCertificate | fl
To renew a self-signed certificate for Exchange Edge you can use Exchange Management Shell command:
Get-ExchangeCertificate | New-ExchangeCertificate
To [...]

How to uninstall Mailbox Role on Exchange Server 2007?

Run commend: setup /m:uninstall /r:mailbox
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How to view Exchange installed certificates in exchange management shell?
Simple run Exchange Management Shell an run the command: Get-ExchangeCertificate | fl

Verb: Services inform you with services use this certificate.
In my example this is IMAP, POP, IIS and SMTP services.

Useful links:

New-ExchangeCertificate cmdlet on Microsoft Technet: http://technet.microsoft.com/en-us/library/aa998327.aspx
Get-ExchangeCertificate cmdlet on Microsoft Technet: http://technet.microsoft.com/en-us/library/bb124950.aspx
Import-ExchangeCertificate cmdlet on Microsoft Technet: http://technet.microsoft.com/en-us/library/bb124424.aspx

 
We need certificates to publish internal Exchange 2007 services (like OWA, ActiveSync, OutlookAnywhere) using Microsoft ISA 2006. We want to get a private SLL certificate from internal Certification Authority (CA). We have to generate a certificate request, for example [...]

If you are deploying a new Exchange organization, and you are preparing your Active Directory schema and domain by using a computer running Windows Server 2008, you must first install the Active Directory Domain Services remote management tools on Windows Server 2008.
To install ADDS remote management tools run command:
ServerManagerCmd -i RSAT-ADDS

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Next you must install Windows [...]

Described method regards access to user mailbox on Microsoft Exchange 2007 mail Server. We presume that our user has got proper privileges to open mailbox for this profile.
 
To open mailbox of a certain user or joint users you can use one of following methods:
1. Login to your own account on OWA, for example:
https://owa.company.local/owa and open [...]

Know issues after installed Rollup 4 to Exchange Server 2007 SP1
1. After restarted server some Exchange services did not start in proper time – solution:
In Registry Editor, locate, and then right-click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
Point to New, and then click DWORD Value. In the right pane of Registry Editor,
Type ServicesPipeTimeout to replace New Value #1, [...]

Microsoft has released Update Rollup 5 for Microsoft Exchange Server 2007 Service Pack 1. You can download Rollup 5 from Microsoft download center here. This update does not apply to Exchange Server 2007 RTM.
Update Rollup 5 for Exchange Server 2007 SP1 fixes the issues that are described in the following Microsoft Knowledge Base articles:
??c KB925371 [...]

Today I had problem with Edge server.
Edge Transport Server was not able to route incoming emails to Hub Transport.
I found this error in Queue Viewer on Edge Server: 451 4.4.0 DNS query failed.
I checked Host file and it included the Host records for the Hub Transport servers.
I tested connection to Hub Server by ran [...]