Greylisting – Use Against E-mail Spam

Definition: In name, as well as operation, greylisting is related to whitelisting and blacklisting. What happen is that each time a given mailbox receives an email from an unknown contact (ip), that mail is rejected with a "try again later"-message (This happens at the SMTP layer and is transparent to the end user). This, in the short run, means that all mail gets delayed at least until the sender tries again - but this is where spam loses out! Most spam is not sent out using RFC compliant MTAs; the spamming software will not try again later.

Source: http://www.greylisting.org/

Remove the Backed Up Files After Windows 7 / Windows Server 2008 R2 SP1

dism /online /cleanup-image /spsuperseded

DNS Lookup Tool - DIG

A windows version of dig can be downloaded at http://www.isc.org/downloads.

Example commands:

• dig abc.com
• dig abc.com any
• dig abc.com ns
• dig abc.com mx
• dig abc.com any @dns-server

Remove IT Policy from a BlackBerry Smartphone

There are many methods to remove an IT policy from a BlackBerry smartphone.  See this KB for more details.  Here is the easiest method (I think) – using loader.exe.

1. Connect the smartphone to the computer.
   From the Start menu, click Programs > Accessories > Command Prompt.
   Note: When a computer running Windows Vista™ or Windows 7 is used, the user might need to right-click the Command Prompt application and choose Run as administrator.
2. Find the Apploader folder by typing cd C:\Program Files\Common Files\Research In Motion\Apploader and then pressing ENTER.
   Note: For computers using a 64-bit version of Windows, navigate to C:\Program Files (x86)\Common Files\Research In Motion\Apploader.
3. Type loader.exe /resettofactory.
4. Type the BlackBerry smartphone password if prompted.

Exchange Server Licensing

• One Exchange server license per Exchange server
• Exchange Standard v.s Enterprise edition:
• 5 databases per Standard edition
• 100 databases per Enterprise edition
• For database availability group (DAG), do not need Exchange Enterprise edition; however, must have Windows Server 2008 or Windows Server 2008 R2 Enterprise edition.
• One client access license (CAL) per user
• Standard v.s. Enterprise CAL:
• Enterprise CALs are add-ons to Standard CALs.  To buy Enterprise CALs must buy the amount of Standard CALs.
• Enterprise CAL features:
• Unified messaging
• Custom retention policies
• Advanced Exchange ActiveSync policies
• Per-user or per-distribution-list journaling
• Personal Archive feature
• Multi-mailbox search
• Information protection and control feature set

Comparison of Exchange ActiveSync Clients

http://en.wikipedia.org/wiki/Comparison_of_Exchange_ActiveSync_Clients

Windows 7 or Windows Vista Wake Timer

Windows Vista and later support wake timers that scheduled tasks can use, allowing a system to automatically wake from sleep or hibernate at a certain time.

• Schedule a task:
• Launch Task Scheduler, Conditions tab, select Wake the computer to run this task.
• List all active wake timers
• Cmd, powercfg –waketimers
• List all devices that are capable of waking a machine from sleep
• Cmd, powercfg –devicequery wake_armed