Client Access Server
Microsoft® Internet Explorer®, Mozilla Firefox™,
Safari®
OWA & ECP
Mobile Devices
EAS
Outlook®, Entourage®, LOB apps
EWS
Outlook, Entourage,
Line-of-Business (LOB) apps, Mobile Devices
Outlook
Outlook from the Internet
Thunderbird
Outlook
Outlook
Autodiscover
Offline Address Book
download
Outlook Anywhere
POP/IMAP
RPC Client Access
Service
Address Book
Service
RPC
Mailbox
Server
Lightweight Directory
Access Protocol
(LDAP)
Domain
Controller
Proxied
HyperText Transfer
Protocol (HTTP)
Other CAS
Server
Exchange Components (EWS,
Outlook, other MAPI clients
ActiveSync®,
UM, OWA, Mailbox
Agents, Transport Agents)
Entourage, 3rd party
apps
ActiveSync, UM, OWA, Mailbox
Agents, Transport Agents)
Entourage,
party
apps
MAPI RPC
Store
DAV*
Middle
Tier
3rd
Exchange
Business
Logic
Exchange Core Business
Logic
MAPI, RFR & NSPI
RPC
Mailbox
Mailbox
Middle
Tier
Outlook, other
MAPI clients
Exchange
Business Logic
Exchange Components (EWS,
MAPI RPC
Store
Outlook Clients
Exchange CAS Array
MBX
GC
Exchange
Components (EWS,
Mailbox
Middle
Tier
Client saves
item (new or
existing)
ActiveSync, UM, OWA,
Mailbox Agents,
Transport Agents)
Exchange
Business
Logic
Exchange Core Business
Logic
MAPI, RFR &
NSPI RPC
MAPI RPC
Store
On Save:
• If it’s a meeting message, make a
copy in the Calendar Logging folder
• If the Save is a Delete, make a
copy in the Recoverable Items
folder
Open Mailbox:
/o=contoso/ou=First Administrative
Group/cn=Recipients/cn=user1/guid=3F2504E
0-4F89-11D3-9A0C-0305E82C3301
Mailbox
Middle
Tier
Return archive
mailbox session
Exchange
Business
Logic
Exchange Core Business
Logic
MAPI, RFR &
NSPI RPC
MAPI RPC
Store
Parse the legacy DN: does
this object represent a
regular mailbox or an
archive?
• If a regular mailbox,
perform regular AD DS
lookup and return the
mailbox
• If an archive, look up the
primary mailbox and
return the associated
archive
Outlook
Outlooktries
triesto
reconnect
again
Outlook1
Outlook2
Outlook3
Load Balancer
RPC Client Access
Service
CAS Array
RPC Client Access
Service
RPC Client Access
Service
CAS
Active
Manager
Fails
Client
Active
Manager
Client
CAS1
Active
Manager
Client
CAS2
CAS3
If failover is inActive
progress
AM
Outlook’s
DB
failover
Manager
reconnect
isDB
complete
Returns
triggers
Mailbox
& AM
new
Where’s
the
returns old server
& connect
returns
AM
Server1
new
request
server
fails mounted?
MAPI RPC
Store
Disk
Fails
Active
Manager
Mailbox
Server1
MAPI RPC
Store
Active
Manager
Mailbox
Server2
DAG
MAPI RPC
Store
Active
Manager
Mailbox
Server3
MAPI RPC
Store
Active
Manager
Mailbox
Server4
Home Server = CAS-PRI
HT2010
CAS-Pri
CAS-Sec
HT2010
MBX-C
MBX-D
DAG
MBX-A
MBX-B
RPCClientAccessServer = CAS-PRI
Secondary Datacenter (SDC)
Primary Datacenter (PDC)
Outlook 2010
RPCClientAccessServer = CAS-PRI
Outlook 2003 can’t update if
source CAS is unavailable
Outlook 2003
Outlook 2007
Outlook 2010
Autodiscover
detects
profile
change
Autodiscover
detects
profile
change
butand
does
updates
thethe
profile
to to
useuse
new
CAS
not
update
profile
new
thearray
RPC
(requires
CAS arrayrestart)
value
HT2010
CAS-Sec
HT2010
MBX-C
MBX-D
CAS-Pri
DAG
MBX-A
MBX-B
Secondary Datacenter
Autodiscover detects profile
change
profile
to
changeand
but updates
does notthe
update
the
use new
CASnew
array
profile
to use
the(requires
RPC CAS
restart)
array
value
Primary Datacenter
Outlook continues to use
existing Home Server defined
in the profile (CAS-PRI)
After *over, manually change
RPCClientAccessServer = CAS-SEC
AD DS
CAS
Outlook
NSPI
Common Business Logic
LDAP
4
3
CAS 2010
2
MBX 2010
GC
AD DS
Site 2
AD DS
Site 1
1
CAS 2010
MBX 2010
GC
NSPI
RPC
Add/Remove-DistributionGroupMember
Set-Mailbox -PublicDelegates
Set-Mailbox -UserCertificate -UserSMIMECertificate
LDAP
Active
Directory
Persistence: Required
Persistence: Recommended
Persistence: Not Required
Outlook Web App
Outlook Anywhere
Offline Address Book
Exchange Control Panel
Activesync
AutoDiscover
Exchange Web Services
Address Book Service
POP3
RPC Client Access Service
Remote PowerShell
IMAP4
HTTP-Based Workloads
Workload
Outlook Web App
Preferred Session Persistence Method
1. Client IP
2. App Cookie “UserContext”
Exchange Control Panel
Autodiscover
RPC Client Access
Exchange Address Book
1. Client IP
2. App Cookie “mxExchEcpCanary”
1. Client IP
2. Authorization HTTP header
1. Cookie
2. SSL ID
1. Client IP
2. No affinity/persistence
3. App Cookie “OutlokSession”
1. Client IP
2. SSL ID
No affinity/persistence
1. Client IP
1. Client IP
RPC Endpoint Mapper
1. Client IP
Client IP
Post Office Protocol (POP3)
No affinity/persistence
No affinity/persistence
Internet Message Access Protocol (IMAP4)
No affinity/persistence
No affinity/persistence
Exchange ActiveSync
Exchange Web Services
Outlook Anywhere
TCP Socket Oriented
Workloads
Offline Address Book
MSIT-Deployed Session Persistence Method
Custom Script
1.) SSL Session ID until App Cookie “UserContext”
is generated
App Cookie “msExchEcpCanary”
Authorization HTTP header
App Cookie
SSL Session ID (fallback)
No affinity/persistence
SSL ID
No affinity/persistence
Client IP
Client IP
http://europe.msteched.com/topic/list/