Topic Last Modified: 2011-05-16
In addition to the software support described in the other sections of this Supportability documentation, Microsoft Lync Server 2010 has the following support limitations:
- Lync Server 2010 supports Domain Name System (DNS) and hardware
load balancing for specific server roles. It also supports
application load balancing for Mediation Servers, where
appropriate. For details about when to use each, see the Planning
- Lync Server 2010 uses the Distribution List Expansion Protocol
(DLX) to expand distribution lists. This protocol also specifies
the web service method that is used to get the membership of a
distribution list. Microsoft Exchange Server supports dynamic
groups that do not have members statically assigned to them.
Instead, they store queries that are evaluated when the group is
expanded. DLX does not support dynamic distribution lists.
- The Enable User Wizard does not support automatic conversion of
non-English characters to a SIP-compliant URI, so you must modify
the SIP address manually.
- For servers running antivirus software, include all servers
running Lync Server 2010 in the exception list in order to provide
optimal performance and audio quality. For details, see Specifying Anti-Virus
Scanning Exclusions in the Security documentation.
- If you use IPsec, we recommend disabling IPsec over the port
ranges used for audio and video traffic. For details, see IPsec Exceptions in
the Planning documentation.
- If your organization uses a Quality of Service (QoS)
infrastructure, the media subsystem is designed to work within this
existing infrastructure. For details about implementing QoS, see
of Service (QoS) in the Operations documentation.
- Use of the operating system firewall is supported. Lync Server
2010 manages the firewall exceptions for the operating system
firewall, except for Microsoft SQL Server database software. For
details about SQL Server firewall requirements, see the SQL Server
- The external interfaces used to implement support for external
user access must be on a separate subnet, not on the same
network as the internal interfaces.
- Lync Server 2010 does not support two-factor authentication.
However, if you deploy Lync Server in a network environment that
already provides two-factor authentication (for example, a VPN with
two-factor authentication), Lync Server works in that
- Lync Server 2010 and Microsoft Exchange Server 2010 Service
Pack 1 (SP1) operate with support for Federal Information
Processing Standard (FIPS) 140-2 algorithms if the Windows
Server 2008 Service Pack 2 (SP2) Windows
Server 2008 R2 operating systems are configured to use
the FIPS 140-2 algorithms for system cryptography. To implement
FIPS support, you must configure each server running Lync Server
2010 to support it. For details about FIPS-compliant algorithms and
how to implement FIPS support, see Microsoft Knowledge Base article
811833, “The effects of enabling the “System cryptography: Use FIPS
compliant algorithms for encryption, hashing, and signing" security
setting in Windows XP and in later versions of Windows,” at
For details about FIPS 140-2 support and limitations in Exchange
2010, see “Exchange 2010 SP1 and Support for FIPS Compliant
Algorithms” at http://go.microsoft.com/fwlink/?LinkId=205335.
Lync Server 2010 requires the installation of other software on specific components prior to or during deployment. This includes software that is available with the operating system, downloadable software, and software that is automatically installed during installation of Lync Server 2010. Following is a list of additional software that can be required:
- Windows Update
- Message Queuing Server and Message Queuing Directory Service
- Microsoft .NET 3.5 with Service Pack 1 (SP1) Framework
- Microsoft Visual C++ 2008 Redistributable
- Microsoft Visual J# version 2.0 Redistributable
- URL Rewrite Module version 2.0 Redistributable
- Windows Media Format Runtime
- Windows PowerShell version 2.0
- Windows Installer version 4.5
- Microsoft Silverlight 4 browser plug-in (Silverlight
4.0.50524.0 or the latest version for Lync Server Control
- Active Directory Domain Services (AD DS) tools
- SQL Server
Some of these software requirements only apply to specific server roles or components. For details about these software requirements, see Additional Software Requirements in the Planning documentation.