We don't yet know what the next version of Microsoft Exchange Server will be called. Exchange 15 is an assumption based on the version number, the last being Microsoft Exchange Server 2010 which was version 14 (14.01.0218.015 for SP1, to be specific). We also don't yet know when Exchange 15, or Exchange Server 2013 (based on the three year cycle) will be released into the wild.
So while we are waiting, here's a quick look at the versions that have come before:
The Younger Half-Cousin Done Good - Exchange 1.0
Actually not a server product at all, Exchange 1.0 or Windows Messaging to give it its real name was an email client included in Windows 95, 98 and NT4. The fashion at the time, 1996, was to lack support for Internet email so if you were looking for SMTP or POP3 support you were out of luck unless you installed the separate Microsoft Plus! pack, codename 'Frosting'. Frosting included other delights such as Space Cadet Pinball, DriveSpace 3 and some space-age screensaver and wallpaper files.
Windows Messaging had us hooked though; we never looked back. In 1996 HTML messages were evil, our marketing departments hadn't yet realized how to brand plan text emails yet. It was de rigueur to include an obscure quote in your footer, and if you were really out to impress, a string of special characters on the verge of ASCII art. There was no support for international characters either; sorry, the rest of the world you lose.
The First Server, Server Product - Exchange 4.0
The server side of the business came crashing through the door one day wanting in on the new funky Windows Messaging action. Exchange Server 4.0 was born as an upgrade to Microsoft Mail 3.5, which in 1991 was slowly turning into something called Network Courier in. Lotus were very excited about acquiring cc:Mail at about the same time, so the race was on.
Our CEO, Peter Bauer still proudly displays his Microsoft Mail 3.5 certifications on the office wall.
Exchange Server 4.0 was a wholly new system, designed on the X400 client-server model, supported by a single database and an X500 directory service, which later morphed into Active Directory.
1997 Microsoft Valued at $261 Billion and Exchange Server 5.0
In the year Microsoft becomes the World's most valuable company, and Bill Clinton is returned to office for a second term, as is Steve Jobs; Microsoft release Exchange 5.0 and the new Exchange Administrator Console.
Adding the new Internet Mail Connector allowed your new shiny Exchange 5.0 server to communicate over the internet via SMTP, for the first time allowing your users to arrange their days around the send/receive button. Exchange 5.0 also introduced a new-fangled web-based email interface uninspiringly called, Exchange Web Access.
A Few Short Months Later - Exchange Server 5.5
In November 1997 while the tech world was distracted by the $37 Billion merger of WorldCom and MCI Communications, Microsoft snuck out Exchange 5.5, which was sold in two editions, Standard and Enterprise. Standard was limited to a 16GB database which was a throwback to previous versions, whereas Enterprise Edition had a database limit of 16TB. I remember building a business case for Enterprise Edition and having to explain to the business why 16GB wasn't enough - if only we knew then what we know now.
Drum Roll Please, Ladies and Gentlemen Exchange 2000 Server
By November 2000 we're on Exchange Server version 6.0, codename Platinum. A big leap forward with changes to support clustering and database size limitations. But, the upgrade required there to be a complete Microsoft Active Directory infrastructure on the network as there was no built-in directory. There was no in-place upgrade from previous versions of Exchange, so consultants and Microsoft Partners made merry with the consulting hours as customers required both platforms to be online at once.
Codename Titanium - Exchange Server 2003
Version 6.5 added some useful migration tools that helped companies consolidate their distributed Exchange environments; I have a true story that demonstrates this perfectly. One client of mine, who had twenty different Exchange Servers, one for each letter of the alphabet, distributed users depending on their surname, doubling up for some of the less common letters like X, Y & Z. All twenty servers, none of which were virtualized, sat in the same datacenter in central London. How they got to this stage was a long story, but the realization that Exchange Server 2003 could help them resolve this problem saw twenty servers whittled down to a handful of streamlined clusters in four locations across the globe.
Bells and Whistles and a Big Fanfare - Exchange Server 2007
Exchange Server 2007 was released amid much fanfare and marketing by Microsoft, and rightly too, this version brought some wonderful new technologies and functionality. Sadly though some users chose not to upgrade and stayed languishing on Exchange Server 2000 and 2003, I even knew a few still on 5.5!
64 bit support was a bit of a struggle for some customers, but eventually gave every IT department the budget to upgrade their old Exchange Server to a new, faster one. The 2007 release was version 8, codename E12 and brought and Enterprise Edition which allowed a whopping 16TB maximum database size.
HA Database Clustering was given a whole new batch of TLAs;, SCC, LCR, SCR and CCR. The Exchange Management Shell arrived as did Unified Messaging and Outlook Anywhere (which was really called RPC over HTTP).
However Microsoft announced the death of Public folders in the next release, due to what they call a 'Wild West' of public folders.
Which Brings us Right up to Today - Exchange Server 2010
November 2009: Exchange Server 2010, or Exchange 14 to those in the know, hit the market brimming with cool new features. Database Availability Groups or DAGs became even more popular than ever before replacing the Clustering options from Exchange Server 2007. Server Roles became important to Exchange Architects everywhere and sparked much debate about where in the network to put the CAS.
Luckily large mailbox support was extended after its initial introduction to Exchange Server 2007, which was good news for most as their end users had been using disk space like there was no tomorrow and databases everywhere were getting rather full. To this day I know an end user who refuses to 'clean out' their 32GB mailbox on the basis that he "needs" all of that email and knows "exactly where it all is" - you know who you are sir, if you're reading this.
Public Folders are included in 2010 and not deprecated as planned.
Unfortunately some businesses are still languishing on old versions like Exchange Server 2000 and 2003. You also know who you are, and you know how keen we are to get you to Exchange Server 2010.
Enter the Cloud - Office 365
Luckily for administrators dealing with "Mr. I've got a Huge Mailbox & I don't Care" the Cloud started to make life easier, by offloading some of those Big Data and Email Management issues. Microsoft have just launched Office 365 and introduced Exchange Online. Although EO has been around since about 2005 and mainstream since 2008, it's only now that users are beginning to see the real benefits of the Cloud.
Enter Exchange 15
What Exchange 15 or Exchange Server 2013 will bring is still shrouded in Mystery, even the Servers real name is unknown (I hoping for "Philip") but it's just round the corner and slowly information is trickling out of Redmond.
Personally, I can't wait.