Microsoft 1 manual Opaque item, Outlook Web Access, Policy, Post Office Protocol version 3 POP3

Glossary 107

OLE DB

An Application Programming Interface (API) that allows low-level programming languages such as C and C++ to access dissimilar data stores through a common query language. OLE DB is seen as the replacement for Open Database Connectivity (ODBC). Data stores such as those in Exchange 2000 and SQL Server allow for OLE DB access, which makes appli- cation development easier and faster.

High-level programming languages such as Visual Basic can use ActiveX Data Objects (ADO) to issue queries through OLE DB.

Opaque item

Message text that cannot be read without being deciphered, also known as an enciphered item.

Outlook Web Access

The Web browser interface to Exchange Server mailbox and public folder data. The Outlook Web Access client in Exchange Server 5.x uses Active Server Pages to render collaboration data into HTML, whereas the Outlook Web Access Client in Exchange 2000 uses native access to the store.

Policy

A collection of configuration settings that can be applied to objects of the same class in Active Directory. In relation to Exchange 2000, this may include mailbox thresholds and deleted item retention.

Post Office Protocol version 3 – POP3

A standards-based protocol for simple access to Inbox data. All versions of Exchange server except version 4.0 support POP3. POP3 uses TCP/IP port 110 for client to server access.

Protocol farm

A collection of virtual servers that are used as the primary connection point for users in an organization. The farm abstracts the connection protocols from the location of the back- end data, which allows users to access information without having to know its physical location.

Public folder connection agreement – PFCA

A connection agreement in the Active Directory Connector (ADC) that is responsible for replicating Public Folder proxy objects between the Exchange 5.5 directory and Active Directory. These objects are necessary for sending e-mails directly to the folder. Each PFCA is hard-coded to be two-way, and will replicate between the site naming context in Ex- change 5.5 and the ‘Microsoft Exchange System Objects’ container in the Active Directory domain. It is normal to create one PFCA for each Exchange 5.5 site in the organization.