Information about Microsoft Exchange Server
| Microsoft Exchange Server | |
| Developer: | Microsoft Corporation |
|---|---|
| Latest release: | 2007 / December 7, 2006 |
| OS: | Microsoft Windows |
| Platform: | x86-64 (previous versions: x86) |
| Available language(s): | multilanguage |
| Status: | Active |
| Genre: | Collaborative software |
| License: | MS-EULA |
| Website: | www.microsoft.com/exchange |
Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions. Exchange's major features consist of electronic mail, calendaring, contacts and tasks, and support for the mobile and web-based access to information, as well as supporting data storage.
History
Planning the migration from Microsoft's own "legacy XENIX-based messaging system" to Exchange Server environment began in April 1993 [1], and by January 1995 some 500 users were running on Exchange Server Beta 1. By April 1996 32,000 users were migrated to the environment.Exchange Server 4.0, released on June 11, 1996, was the original version of Exchange Server sold to the public, positioned as an upgrade to Microsoft Mail 3.5. The original version of Microsoft Mail (written by Microsoft) had been replaced several weeks after Lotus acquired by a package called Network Courier, acquired during the purchase of Consumer Software Inc. in April of 1991.[2] Exchange Server was however an entirely new X.400-based client-server mail system with a single database store that also supported X.500 directory services. The directory used by Exchange Server eventually became Microsoft's Active Directory service, an LDAP-compliant directory server. Active Directory was integrated into Windows 2000 as the foundation of Windows Server domains.
On May 23, 1997, Exchange Server 5.0 was released, which introduced the new Exchange Administrator console, as well as opening up "integrated" access to SMTP-based networks for the first time. Unlike Microsoft Mail (which required a standalone SMTP relay), Exchange Server 5.0 could, with the help of an add-in called the Internet Mail Connector, communicate directly with servers using the internet mail standard. Version 5.0 also introduced a new Web-based e-mail interface Exchange Web Access, this was rebranded as Outlook Web Access in a later Service pack. Along with Exchange Server version 5.0, Microsoft released version 8.01 of Microsoft Outlook, version 5.0 of the Microsoft Exchange Client and version 7.5 of Microsoft Schedule+ to support the new features in the new version of Exchange Server.
Exchange Server 5.5, introduced November, 1997, was sold in two editions, Standard and Enterprise. They differ in database store size, mail transport connectors and clustering capabilities. The Standard Edition had the same 16 GB database size limitation as earlier versions of Exchange Server, while the Enterprise Edition had an increased limit of 8 TB (although Microsoft's best practices documentation recommends that the message store not exceed 100 GB). The Standard Edition includes the Site Connector, MS Mail Connector, Internet Mail Service (previously "Internet Mail Connector"), and Internet News Service (previously "Internet News Connector"), as well as software to interoperate with , Lotus Notes and Novell GroupWise. The Enterprise Edition adds an X.400 connector, and interoperability software with SNADS and PROFS. The Enterprise Edition also introduced two node clustering capability. Exchange Server 5.5 introduced a number of other new features including a new version of Outlook Web Access with Calendar support, support for IMAP4 and LDAP v3 clients and the Deleted Item Recovery feature. Exchange Server 5.5 was the last version of Exchange Server to have separate directory, SMTP and NNTP services. There was no new version of Exchange Client and Schedule+ for version 5.5, instead version 8.03 of Microsoft Outlook was released to support the new features of Exchange Server 5.5.
Exchange Server 2000, released on November 29, 2000, overcame many of the limitations of its predecessors. For example, it raised the maximum sizes of databases and increased the number of servers in a cluster from two to four. However, many customers were deterred from upgrading by the requirement for a full Microsoft Active Directory infrastructure to be in place, as unlike Exchange Server 5.5, Exchange Server 2000 had no inbuilt Directory Service, and had a dependency upon Active Directory. The migration process from Exchange Server 5.5 did not have any in-place upgrade path, and necessitated having the two systems online at the same time, with user-to-mailbox mapping and a temporary translation process between the two directories. Exchange Server 2000 also added support for Instant Messaging, but that capability was later spun off to Microsoft Office Live Communications Server. This migration was made significantly easier by Exchange Server 2003 (although still involved the same basic steps); many users of Exchange Server 5.5 waited for the release of Exchange Server 2003 to upgrade. The upgrade process also required upgrading a company's servers to Windows 2000. Some customers opted to stay on a combination of Exchange Server 5.5 and Windows NT 4.0, both of which are no longer supported by Microsoft.
Exchange Server 2003
Exchange Server 2003 debuted on September 28, 2003. Exchange Server 2003 (currently at Service Pack 2) can be run on Windows 2000 Server (only if Service Pack 4 is first installed) and 32-bit Windows Server 2003, although some new features only work with the latter. Like Windows Server 2003, Exchange Server 2003 has many compatibility modes to allow users to slowly migrate to the new system. This is useful in large companies with distributed Exchange Server environments who cannot afford the downtime and expense that comes with a complete migration.One of the new features in Exchange Server 2003 is enhanced disaster recovery which allows administrators to bring the server online quicker. This is done by allowing the server to send and receive mail while the message stores are being recovered from backup. Some features previously available in the Microsoft Mobile Information Server 2001/2002 products have been added to the core Exchange Server product, like Outlook Mobile Access and server-side ActiveSync, while the Mobile Information Server product itself has been dropped. Better anti-virus and anti-spam protection have also been added, both by providing built-in APIs that facilitate filtering software and built-in support for the basic methods of originating IP address, SPF ("Sender ID"), and DNSBL filtering which were standard on other open source and *nix-based mail servers. Also new is the ability to drop inbound e-mail before being fully processed, thus preventing delays in the message routing system. There are also improved message and mailbox management tools, which allow administrators to execute common chores more quickly. Others, such as Instant Messaging and Exchange Conferencing Server have been extracted completely in order to form separate products. Microsoft now appears to be positioning a combination of Microsoft Office, Microsoft Office Live Communications Server, Live Meeting and Sharepoint as its collaboration software of choice. Exchange Server is now to be simply e-mail and calendaring.
Exchange Server 2003 is available in two versions, Standard Edition and Enterprise Edition. Standard Edition supports one message database per server, and supports databases up to 16 GB in size. Beginning with the release of Service Pack 2, Standard Edition allows a maximum database size of 75 GB, but only supports 18 GB by default; larger sizes databases have to be opted-in with a registry change.[3] Enterprise Edition allows a 16 TB maximum database size, and supports up to 4 storage groups with 5 databases per storage group for a total of 20 databases per server.[4]
Exchange Server 2003 is included with both Microsoft Small Business Server 2003 Standard and Premium editions and is 32-bit only, and will not install on the various 64-bit versions of Windows Server 2003.
Microsoft Exchange Server uses a proprietary RPC protocol, of which only the API is documented (see MAPI). It was designed to be used by the Microsoft Outlook client. E-mail hosted on an Exchange Server can be accessed using POP3 and IMAP4, with clients such as Mozilla Thunderbird and Lotus Notes. Both Microsoft Outlook and Novell Evolution are clients capable of using the advanced features of Exchange Server; Microsoft Entourage for Mac also has most of the advanced features implemented in the latest version. Exchange Server mailboxes can also be accessed through a web browser, known as Outlook Web Access (OWA). Exchange Server 2003 also featured a version of OWA for mobile devices, called Outlook Mobile Access (OMA).
Coupled with Windows Mobile 5.0 AKU2 or higher, Exchange Server 2003 SP2 supports "pushing" e-mail to mobile devices - similar to the operation of BlackBerry devices.[5][6]
Unlike Exchange Server 2000, Exchange Server 2003 no longer ships instant messaging for internal corporate systems. Microsoft released Live Communication Server to provide those services as a standalone program.
Exchange 2003 Anti-Spam Filtering: Exchange Server 2003 added several basic filtering methods to Exchange Server. They are not sophisticated enough to eliminate spam, but they can protect against DoS and mailbox flooding attacks. Exchange Server 2000 supported the ability to block a sender's address, or e-mail domain by adding '*@domain.com', which is still supported in Exchange Server 2003. Added filtering methods in Exchange Server 2003 are:
- Connection filtering - messages are blocked from DNS RBL lists[7] or from manually specified IP addresses/ranges
- Recipient filtering - messages blocked when sent to manually specified recipients on the server (for intranet-only addresses) or to any recipients not on the server (stopping spammers from guessing addresses)
- Sender ID filtering - Sender ID, a form of SPF
- Intelligent Message Filter - A free Microsoft add-on that uses heuristic message analysis to block messages or direct them to the "Junk E-Mail" folder in Microsoft Outlook clients.[8]
Exchange Server 2007
For some time after the release of Exchange Server 2003, Microsoft's future plans for the product were not known. Edge Services, an add-on for the main product, was to have been released sometime in 2005 but was dropped. The new version, Exchange Server 2007, was released in late 2006 to business customers as part of Microsoft's rollout wave of new products. It includes voice mail integration, better search and support for Web services, better filtering options, and a new Outlook Web Access interface.Exchange Server 2007 runs on 64-bit x86-64 versions of Windows Server only, pointing out the substantial performance benefits that 64-bit computing brings to the product. This limitation applies to supported production environments only; a 32-bit trial version is available for download and testing. However, companies currently running Exchange Server on 32-bit hardware will be forced to replace or migrate hardware if they wish to upgrade to the new version. Companies that are currently running Exchange Server on 64-bit capable hardware are still required to simultaneously upgrade their server operating system to a 64-bit version in order to use Exchange Server 2007.
The first beta of Exchange Server 2007 (then named "Exchange 12") was released in December 2005 to a very limited number of beta testers. A wider beta was made available via TechNet Plus and MSDN subscriptions in March 2006 according to the Microsoft Exchange team blog. On April 25 2006, Microsoft announced that the next version of Exchange Server would be called Exchange Server 2007.
Key improvements
The principal enhancements, as outlined by Microsoft, are:[9]- Protection: anti-spam, antivirus, compliance, clustering with data replication, improved security and encryption
- Improved Information Worker Access: improved calendaring, unified messaging, improved mobility, improved web access
- Improved IT Experience: 64-bit performance & scalability, command-line shell & simplified GUI, improved deployment, role separation, simplified routing
- Exchange Management Shell: a new command-line shell and scripting language for system administration (based on Windows PowerShell). Shell users can perform every task that can be performed in the Exchange Server graphical user interface plus additional tasks, and can program often-used or complex tasks into scripts that can be saved, shared, and re-used. The Exchange Management Shell has over 375 unique commands to manage features of Microsoft Exchange Server 2007.[10]
- "Unified Messaging" that lets users receive voice mail, e-mail, and faxes in their mailboxes, and lets them access their mailboxes from cell phones and other wireless devices. Voice commands can be given to control and listen to e-mail over the phone (and also send some basic messages, like "I'll be late")
- Removed the database maximum size limit. Database size is now limited by hardware capability and the window for backups and maintenance.
- Increased the maximum number of storage groups and mail databases per server, to 5 each for Standard Edition (from 1 each in Exchange Server 2003 Standard), and to 50 each for Enterprise Edition (from 4 groups and 20 databases in Exchange Server 2003 Enterprise).
Clustering and High Availability
Exchange Server Enterprise Edition supports clustering of up to 4 nodes when using Windows 2000 Server, and up to 8 nodes with Windows Server 2003. Exchange Server 2003 also introduced Active/Active clustering, but for two node clusters only. In this setup, both servers in the cluster are allowed to be active simultaneously. This is opposed to Exchange's more common Active/Passive mode in which the failover servers in any cluster node cannot be used at all while their corresponding home servers are active. They must wait, inactive, for the home servers in the node to fail. Subsequent performance issues with Active/Active mode have led Microsoft to recommend that it should no longer be used.[11] In fact, support for Active/Active mode clustering has been discontinued with Exchange Server 2007.Exchange's clustering (Active/Active or Active/Passive mode) has been criticised because of its requirement for servers in the cluster nodes to share the same physical data. The clustering in Exchange Server provides redundancy for Exchange Server as an application, but not for Exchange data.[12] In this scenario, the data can be regarded as a single point of failure, despite Microsoft's description of this set up as a "Shared Nothing" model.[13] This void has however been filed by ISV's and storage manufacturers, through "site resilience" solutions, such as geo-clustering and asynchronous data replication.[14] Exchange Server 2007 introduces new cluster terminology and configurations that address the shortcomings of the previous "shared data model".[15]
Exchange Server 2007 now provides built-in support for asynchronous replication modeled on SQL Server's "Log Shipping"[16] in CCR (Cluster Continuous Replication)[17] clusters, which are built on MSCS MNS (Microsoft Cluster Service - Majority Node Set) clusters which do not require shared storage. This type of cluster can be inexpensive and deployed in one, or "stretched" across two datacenters for protection against site wide failures such as natural disasters. The limitation of CCR clusters is ability to have only two nodes and the third node known as "voter node" of file share witness[18] that prevents "split brain"[18] scenarios, generally hosted as a file share on a Hub Transport Server.[19] Second type of clusters is the traditional clustering that was available in previous versions, and is now being referred to as SCC (Single Copy Cluster). In Exchange Server 2007 deployment of both CCR and SCC clusters has been simplified and improved where the entire cluster install process takes place during Exchange Server install. LCR or Local Continuous Replication[19] has been referred to as the "poor man's cluster". It is designed to allow for data replication to an alternate drive attached to the same system and is intended to provide protection against local storage failures. It does not protect against the case where the server itself fails.
In February, the Microsoft Exchange team announced they are wrapping up the beta release of SP1 for Exchange Server 2007. It was announced that SP1 will include an additional high availability feature called SCR (Standby Continuous Replication). Unlike CCR which requires that both servers belong to a Windows cluster, typically residing in the same datacenter, SCR can replicate data to a non-clustered server, located in a separate datacenter.
Licensing
Like Windows Server products, Exchange Server requires Client Access Licenses, which are different from Windows CALs. Most corporate license agreements include Exchange Server CALs. For Service Providers looking to host Microsoft Exchange, there is a SPLA (Service Provider License Agreement) available whereby Microsoft receives a monthly service fee in the place of the traditional Client Access Licenses. Two types of Exchange CAL are available - Exchange CAL Standard and Exchange CAL Enterprise. The Enterprise CAL is an add-on licence to the Standard CAL.Exchange hosting
Microsoft Exchange Server can also be purchased as a hosted service from a number of providers.[20]See also
- Extensible Storage Engine
- List of collaborative software
- Microsoft Exchange Client
- Microsoft Servers
References
1. ^ Microsoft's Migration to Microsoft Exchange Server - The Evolution of Messaging within Microsoft Corporation. Retrieved on May 2, 2007.
2. ^ Paul Korzeniowski. E-mail becoming foundation for networked applications - electronic mail; local area network. Software Magazine. Retrieved on 2007-07-02.
3. ^ Registry tweak to set a 75gb store limit on Exchange 2003 Standard Sp2. Retrieved on 2007-07-02.
4. ^ Exchange 2003 editions. Retrieved on 2007-07-02.
5. ^ New Mobility Features in Exchange Server 2003 SP2. TechNet. Retrieved on 2007-07-02.
6. ^ Microsoft Looks to Mobilize With Exchange SP2. Retrieved on 2007-07-02.
7. ^ Implementing and Configuring Blacklist Support in Exchange Server 2003. Retrieved on 2007-07-02.
8. ^ Exchange Intelligent Message Filter. Retrieved on 2007-07-02.
9. ^ Microsoft Exchange Server Website
10. ^ Exchange 2007 Cmdlet List
11. ^ Considerations when deploying Exchange on an Active/Active cluster. Retrieved on 2007-07-02. (Logging in required)
12. ^ The benefits of Windows 2003 clustering with Exchange 2003. Retrieved on 2007-07-02.
13. ^ Exchange Clustering Concepts. Retrieved on 2007-07-02.
14. ^ Storage Glossary: Basic Storage Terms. Retrieved on 2007-07-02.
15. ^ High Availability. Retrieved on 2007-07-02.
16. ^ Frequently asked questions - SQL Server 2000 - Log shipping. Retrieved on 2007-07-02.
17. ^ High availability. Retrieved on 2007-07-02.
18. ^ An update is available that adds a file share witness feature and a configurable cluster heartbeats feature to Windows Server 2003 Service Pack 1-based server clusters. Retrieved on 2007-07-02.
19. ^ High Availability. Retrieved on 2007-07-02.
20. ^ Hosted Exchange Partner Directory. Retrieved on 2007-07-02.
2. ^ Paul Korzeniowski. E-mail becoming foundation for networked applications - electronic mail; local area network. Software Magazine. Retrieved on 2007-07-02.
3. ^ Registry tweak to set a 75gb store limit on Exchange 2003 Standard Sp2. Retrieved on 2007-07-02.
4. ^ Exchange 2003 editions. Retrieved on 2007-07-02.
5. ^ New Mobility Features in Exchange Server 2003 SP2. TechNet. Retrieved on 2007-07-02.
6. ^ Microsoft Looks to Mobilize With Exchange SP2. Retrieved on 2007-07-02.
7. ^ Implementing and Configuring Blacklist Support in Exchange Server 2003. Retrieved on 2007-07-02.
8. ^ Exchange Intelligent Message Filter. Retrieved on 2007-07-02.
9. ^ Microsoft Exchange Server Website
10. ^ Exchange 2007 Cmdlet List
11. ^ Considerations when deploying Exchange on an Active/Active cluster. Retrieved on 2007-07-02. (Logging in required)
12. ^ The benefits of Windows 2003 clustering with Exchange 2003. Retrieved on 2007-07-02.
13. ^ Exchange Clustering Concepts. Retrieved on 2007-07-02.
14. ^ Storage Glossary: Basic Storage Terms. Retrieved on 2007-07-02.
15. ^ High Availability. Retrieved on 2007-07-02.
16. ^ Frequently asked questions - SQL Server 2000 - Log shipping. Retrieved on 2007-07-02.
17. ^ High availability. Retrieved on 2007-07-02.
18. ^ An update is available that adds a file share witness feature and a configurable cluster heartbeats feature to Windows Server 2003 Service Pack 1-based server clusters. Retrieved on 2007-07-02.
19. ^ High Availability. Retrieved on 2007-07-02.
20. ^ Hosted Exchange Partner Directory. Retrieved on 2007-07-02.
- "Active Directory LDAP Compliance" Microsoft Corporation, December 2, 2003. Retrieved November 2, 2005.
Books
- Morimoto, Rand; Michael Noel, Chris Amaris, Andrew Abbate, Mark Weinhardt. Exchange Server 2007 Unleashed. ISBN 0672329204.
- McBee, Jim; Barry Gerber. Mastering Microsoft Exchange Server 2007. ISBN 0470042893.
- Cavalancia, MCSE, MCT, MCNE, MCNI, Nick. Microsoft Exchange Server 2007: A Beginner's Guide. ISBN 0071486392.
External links
- What Is Exchange Server? - One-page overview of Exchange Server
- Microsoft Exchange Hosting Provider Directory
- Microsoft Exchange Hosted Archive: How it works - Flow chart of the Exchange network (March 30 2006)
- Microsoft Exchange Server for IT Pros (English)
- Microsoft Exchange Server for IT Pros (French)
- Microsoft Exchange
- Exchange 2007 Edition/CAL Comparison - Exchange 2007 Preview page
- You Had Me At EHLO! - The Microsoft Exchange Team Blog
- Hosted vs. In-house - Microsoft-commissioned wiki white paper to evaluate whether outsourced Exchange is viable for mid-size organizations and above
- Exchange Sync - Software to synchronize public and private folders on an exchange server. Works with appointments, contacts and tasks.
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