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How can I tell what build is my Windows/Exchange server?
It's quite easy to forget which builds your servers are running. Here's a quick way of telling which OS build and Exchange version is running on a remote server:
This video tutorial explains how mailbox availability is achieved in Exchange server 2010 and how the new and improved database recovery and storage features help organizations manage their Exchange environment better.
Watch and learn by starting this video here!Operating System
TELNET to the SMTP port (25) and look at the banner returned.
5.0.2195 - Windows 2000
6.0.3663 - Windows 2003 RC1
6.0.3718 - Windows 2003 RC2
6.0.3790 - Windows 2003 RTM
Exchange Server
TELNET to the SMTP/POP3/IMAP port (25/110/143) and look at the banner returned.
6.0.6249.0 - Exchange 2000 SP3
6.5.6728.0 - Exchange 2003 Beta 1
6.5.6803.0 - Exchange 2003 Beta 2
6.5.6851.0 - Exchange 2003 RC0
6.5.6595.0 - Exchange 2003 RC1-Candidate
6.0.3790.0 - Exchange 2003 RTM
Note: The dot build (italicized) reported by the Exchange protocols will not normally reflect the exact build number you installed. This is because dot builds only contain the actual files changed/fixed since the major version was released.
Related articles
You might also want to read the following related articles:
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Block Incoming Internet Mail to Specific Users or Groups
-
Send Mail (from the Tools and Scripts section)

