Disable USB ports on Windows Registry

With this trick, you can disable USB access ports on Windows based PC to prevent people from taking out data without permission or spreading viruses through the use of USB drives.

Follow the steps :

Click on Start.
Click on Run. If you cannot find RUN, type it in the search box.
Type "regedit" without quotes. This will launch the Registry Editor.

Navigate to  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbstor.

In the work area, double click on Start.
In the Value Data box, enter 4.
Click on OK.

Close Registry Editor and refresh your desktop.
To re-enable access to your USB ports, enter 3 in the Value Data box.

This works on Windows 10, Windows 8, Windows 8.1, Windows 7 and Windows XP.

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Exchange 2007/2010/2013 Server Roles_function of each roles

Server roles allow an administrator to split the functions of an Exchange server and place each role, or a combination of roles, on different servers in the organization. This can be done for performance reasons, management reasons, or any other reason deemed necessary by the organization's policies.

Exchange 2007 introduces five roles

·         Edge Transport

·         Hub Transport

·         Client Access

·         Mailbox

·         Unified Messaging

·         Edge Transport

The Edge Transport role is installed on the edge of the network and therefore is installed on a standalone server that is not a member of the Active Directory domain. This allows the Edge Transport to perform recipient lookups and Spam filtering.

Hub Transport

The Hub Transport role is responsible for all internal mail flow. This role is similar to the bridgehead server in an Exchange 2000/2003 organization. In fact it originally was called the Bridgehead Role until it was changed.

Client Access

The Client Access Role is similar to the role a Front-End server would play in an Exchange 2000/2003 organization. The Client Access server is the server that users connect to with their mail client, mobile device, or web browser. 

 Mailbox

The simplest of the roles has to be the Mailbox Role. Quite simply the Mailbox role holds the Exchange databases within which the user mailboxes are contained. It is also home to the Public Folder databases if you enabled Public Folders. (They are not enabled by default in Exchange 2007)

Unified Messaging

The Unified Messaging role is responsible for merging your VOIP infrastructure with your Exchange organization.

Port exchange server 2013 mail flow:

Port 25 – It was used for SMTP
Port 587 – It was used for Client Connections (POP\IMAP)
Port 717 – It was used for outbound proxy connections.
Port 465 – It was used to accept proxy connection that was received on port 587
Port 475 – Mailbox Transport Delivery Service listens to this port to send mails to the users.
Port 2525 – It was used when CAS and MBX servers are collocated on the same server.

Image Source : Microsoft

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