Let's see some good differences between OCS 2007/R2 and Lync 2010,
Lync 2010 is very good perspective of load balancing and administrative.
OCS 2007 / 2007 R2: Virtualization not supported accepts some roles.
Lync Server 2010Every role can be either virtual or physical.
OCS A/V conferencing service cannot work separate.
LYNC A/V conferencing service can run in a standalone server role which we can call A/V Conferencing Server.
OCS No specific limits for A/V conferencing pool.
LYNC If site has more than 10,000 users, we recommend that you deploy a separate A/V Conferencing pool.
OCS No Survivable Branch Appliance.
LYNC Survivable Branch Appliance, which is a new device introduced in Lync Server 2010.
OCS Mediation role cannot be collocated with Front End Role. LYNC Collocation of mediation with Frond End is recommended if you are not using SIP trunking or Direct SIP.
OCS No Topology Builder.
LYNC Lync 2010 giving you the opportunity to create your own topology for deployment.
OCSNo Central Management Store kind of thing.
LYNC In Microsoft Lync Server 2010, configuration data about servers and services is moved to the Central Management store. Read-only copies of the data are replicated to all servers in the topology, including Edge Servers and survivable branch appliances
OCS No Management Shell accepts LCSCMD command.
LYNC The Lync Server 2010 Management Shell is a new method of administration and management.
OCS No Role base access control.
LYNC Lync 2010 introduces role-based access control (RBAC). Lync Server 2010 includes 11 predefined roles that cover many common administrative tasks; also you can create custom roles.
OCS MMC for Administration.
LYNC Administration console is no longer using MMC, Lync Server Control Panel replaces the MMC administrative interfaces
OCS No load balancing for SIP traffic.
LYNC The Lync Server 2010 introduces DNS load balancing for SIP and media traffic (you will still need hardware LB for other traffic such as HTTP however this is the easiest part in configuring a HW load balancer)
OCS Edge Server is separate and in DMZ.
LYNC You manage Edge Servers from the internal network. All configuration data for servers and services resides in the Central Management database, which you can manage by using internal administrative tools.
OCS No Support for hosted Exchange UM.
LYNC Lync Server 2010 introduces support for integration with hosted Exchange UM.
OCS No Support for Enhanced 9-1-1.
LYNC Lync supports Enhanced 9-1-1 (E9-1-1) as part of your Enterprise Voice deployment.
OCS 1 Mediation means 1 Gateway.
LYNC New for the Mediation Server in Microsoft Lync Server 2010 is the ability for a single Mediation Server to route outbound calls through multiple gateways.
OCS No separate pool for Mediation.
LYNC Lync Server 2010 has the ability for a Mediation Server to be deployed as a pool; this pool can be collocated with the Front End pool, or can be a standalone pool.
OCS MOC cannot be updated through WSUS.
LYNC Lync client can be updated through WSUS.
OCS No support for Analog devices.
LYNC Lync Server 2010 provides support for analog devices. Specifically, the supported analog devices are analog audio phone and analog fax machines. Now you can configure the analog gateways and devices in your organization to use Lync Server 2010.
Lync 2010 is very good perspective of load balancing and administrative.
OCS 2007 / 2007 R2: Virtualization not supported accepts some roles.
Lync Server 2010Every role can be either virtual or physical.
OCS A/V conferencing service cannot work separate.
LYNC A/V conferencing service can run in a standalone server role which we can call A/V Conferencing Server.
OCS No specific limits for A/V conferencing pool.
LYNC If site has more than 10,000 users, we recommend that you deploy a separate A/V Conferencing pool.
OCS No Survivable Branch Appliance.
LYNC Survivable Branch Appliance, which is a new device introduced in Lync Server 2010.
OCS Mediation role cannot be collocated with Front End Role. LYNC Collocation of mediation with Frond End is recommended if you are not using SIP trunking or Direct SIP.
OCS No Topology Builder.
LYNC Lync 2010 giving you the opportunity to create your own topology for deployment.
OCSNo Central Management Store kind of thing.
LYNC In Microsoft Lync Server 2010, configuration data about servers and services is moved to the Central Management store. Read-only copies of the data are replicated to all servers in the topology, including Edge Servers and survivable branch appliances
OCS No Management Shell accepts LCSCMD command.
LYNC The Lync Server 2010 Management Shell is a new method of administration and management.
OCS No Role base access control.
LYNC Lync 2010 introduces role-based access control (RBAC). Lync Server 2010 includes 11 predefined roles that cover many common administrative tasks; also you can create custom roles.
OCS MMC for Administration.
LYNC Administration console is no longer using MMC, Lync Server Control Panel replaces the MMC administrative interfaces
OCS No load balancing for SIP traffic.
LYNC The Lync Server 2010 introduces DNS load balancing for SIP and media traffic (you will still need hardware LB for other traffic such as HTTP however this is the easiest part in configuring a HW load balancer)
OCS Edge Server is separate and in DMZ.
LYNC You manage Edge Servers from the internal network. All configuration data for servers and services resides in the Central Management database, which you can manage by using internal administrative tools.
OCS No Support for hosted Exchange UM.
LYNC Lync Server 2010 introduces support for integration with hosted Exchange UM.
OCS No Support for Enhanced 9-1-1.
LYNC Lync supports Enhanced 9-1-1 (E9-1-1) as part of your Enterprise Voice deployment.
OCS 1 Mediation means 1 Gateway.
LYNC New for the Mediation Server in Microsoft Lync Server 2010 is the ability for a single Mediation Server to route outbound calls through multiple gateways.
OCS No separate pool for Mediation.
LYNC Lync Server 2010 has the ability for a Mediation Server to be deployed as a pool; this pool can be collocated with the Front End pool, or can be a standalone pool.
OCS MOC cannot be updated through WSUS.
LYNC Lync client can be updated through WSUS.
OCS No support for Analog devices.
LYNC Lync Server 2010 provides support for analog devices. Specifically, the supported analog devices are analog audio phone and analog fax machines. Now you can configure the analog gateways and devices in your organization to use Lync Server 2010.
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