Scale Comparison Table Physical-Virtual 
Standard User model with conferencing, PSTN conferencing, and Enterprise Voice
IM&P    = IM and Presence
AS           = Application Sharing
AV          = A/V Conferencing  (collocated if Front End Server)
EV           = Enterprise Voice (Response Group Service/PSTN access), Mediation Server
Reg        = Registrar (subset of IM&P)
AP          = Access Proxy  (Edge Server)
DP          = Data Proxy  (Edge Server)
MR        = Media Relay (Edge Server)

Note: The Virtual Machine numbers are based on a 4 core CPU Virtual Machine.

Lync Server Role
Features
Physical
Virtual
CPU
Memory
User
CPU
Memory
User
Enterprise Edition Front End Server
IM&P
8 core
12 GB
20K
4 core
10 GB
12.5K
Enterprise Edition Front End Server
IM&P, AS, AV, EV
8 core
16 GB
5K
4 core
16 GB
2.5K
Enterprise Edition Front End Server
IM&P, AS, EV
(8 Front End pool)
8 core
12 GB
10K
4 core
11 GB
5K
Enterprise Edition Front End Server
IM&P, AS, EV
(single Front End Server in pool)
8 core
12 GB
7K
4 core
11 GB
4K
Standard Edition Front End Server
IM&P
8 core
16  GB
25K
4 core
12 GB
12.5K
Standard Edition Front End Server
IM&P, AS, AV, EV
8 core
16 GB
5K
4 core
16 GB
2.5K
Director
Reg
4 core
4 GB
20K
4 core
4 GB
10K
Monitor/Archiving Server
8 core
16 GB
230K
4 core
8 GB
110K
A/V Conferencing Server
AV
8 core
16 GB
20K
4 core
11 GB
10K
Mediation Server*
MS
8 core
16 GB
800 concurrent calls
4 core
10 GB
400 concurrent calls
Edge Server
AP, DP   MR
8 core
16 GB
15K
4 core
8 GB
7.5K
Survivable Branch Server
Reg, MS
2 core
2 GB
1K
2 core
2 GB
1K
SQL Server Back End Server (FE)
8 core
32 GB
80K
4 core
16 GB
40K
SQL Backend (M/A)
8 core
16 GB
230K
4 core
12 GB
115K
File Server
4 core
4 GB
80K
2 core
3 GB
40K

*  Stand-alone Mediation Server for deployments without Media Bypass

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