Live Communications Server 2005
Discontinued Microsoft communications server
Live Communications Server 2005 (LCS 2005), codenamed Vienna, is the second version of a SIP based instant messaging and presence server after Live Communications Server 2003. LCS 2005 was first released in 2005, and was updated with new features with Service Pack 1 in 2006. LCS 2005 has been superseded by Microsoft Office Communications Server 2007.
Overview
This product allows SIP clients to exchange IMs and presence using the SIMPLE protocol. The client also allows two clients to set up audio/video sessions, application sharing, and file transfer sessions.
The product was released in two editions, Standard Edition and Enterprise Edition. The Standard Edition uses a Microsoft SQL Server Desktop Engine (MSDE) (included with the product) to store configuration and user data. Enterprise Edition uses a full version of Microsoft SQL Server (purchased separately).
New features to this version compared to the 2003 release is the ability to leverage SQL and remote user access.
Presence is conveyed as levels of availability to communicate.
The public source identifies “Live Communications Server 2005” as discontinued Microsoft communications server. This brief keeps that definition visible, then builds a research path around Live, Communications and Server.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Live Communications Server 2005”, the useful work is to connect “discontinued Microsoft communications server” to the records capable of establishing context and consequence.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 15, 2026. The linked authority identifier is Q6655052. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2005, 2003, 2006 and 2007.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
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The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Live Communications Server 2005”, its source revision and the description used here.
- Expand the search: follow Live Communications Server 2005 primary sources, Live Communications Server 2005 archive and Live research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
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This entry incorporates text from “Live Communications Server 2005” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.