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 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.

Error in SCCM 2007 – Failed to Run Task Sequence 0×80072EE7
When I deployed operating system task to group of computers I received this error:
Failed to Run Task Sequence!
?
In log file of SCCM client X:\Windows\Temp\SMSTSLog\smsts.log I fund this:
<![LOG[Setting wizard error: An error occurred while retrieving policy for this computer? (0x80072EE7). For more information, please [...]

Windows Server 2008 R2 Beta is ready to download.
Microsoft published new version of their operating system for testing.
Top 10 Reasons to Upgrade to Windows Server 2008 R2:
1. Powerful Hardware and Scaling Features.
2. Reduced Power Consumption.
3. Hyper-V??c in Windows Server 2008 R2 (live migration).
4. Increased Desktop Management Efficiencies.
5. Easier and More Efficient Server Management.
6. PowerShell 2.0.
7. [...]

Deploying SCCM 2007 clients via GPO.
1. Import the Configuration Manager 2007 Group Policy ADM template
Start Group Policy Management
Create a new Group Policy Object called SCCM Installation Policy
Edit SCCM Installation Policy and import ConfigMgr2007Installation.adm
(ConfigMgr2007Installation.adm template you can find in folder TOOLS\ConfigMgrADMTemplates\)
2. Configure Configuration Manager 2007 Group Policy
In the Group Policy Object Editor, browse to the [...]

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

?
Next you must install Windows [...]

New functionality in SCCM 2007 R2 – deploy virtual application packages. You can find this feature on ??oSoftware Distribution??? section.

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, [...]

How to display name of servers where FSMO roles are installed?
You must run command: netdom query /Domain:[domain.name] fsmo
For example:
C:\Documents and Settings\Administrator>netdom query /Domain:contoso.local fsmo
Schema owner DC1.contoso.local
Domain role owner DC1.contoso.local
PDC role [...]

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 [...]