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Exchange SLD

Title of Service: The Oxford Nexus (Exchange) Service

Status of Document: This is version 2.3 and is dated 14 December 2017 and describes the Nexus Exchange 2010 service from January 2014.

1. Introduction:

The Oxford Nexus Service provides a suite of software applications to help users work collaboratively within groups. The suite includes: email, online calendar, shared documents, web pages, shared contact lists and other collaboration tools. The Oxford Nexus Service is built on the Microsoft Exchange 2010 and SharePoint 2010 platforms. The Service is available to all staff and students within the collegiate University.

This SLD describes the services available via the Nexus Exchange 2010 implementation. A corresponding SLD (<>) describes the services available via the Nexus SharePoint service.

Users are allocated an initial storage quota of 2GB on the Exchange system. This is a 'hard' quota and is further described at <>. Users requiring an increase in their quota should contact the IT Services Service Desk, Banbury Road in the first instance. You may be asked to justify your request, or to confirm approval from your head of department, IT Support Officer or tutor. A discretionary increase in your quota allowance is unlikely to exceed 3GB. A chargeable 'premium' service is available for those users requiring additional quota in excess of the discretionary allowance. The service is authorised by, and charged to, the unit (department or college) rather than the end-user directly.

IT Support

As with many services provided by IT Services, support is provided through a combination of IT Services and local IT support (ITSS). As the overall Oxford Nexus Service provider, IT Services may always be contacted by users about any aspect of the service.

The Oxford Nexus SLD indicates the primary user support path for the main elements of the Oxford Nexus Service. Primary support is generally provided by either IT Services or local IT support.

Where primary support is not expected to be provided by IT Services, and is, for example, the user's local ITSS then in many cases ITSS are able to instruct IT Services on behalf of the user. Users will generally be referred to IT Services for secondary support where primary support is provided by local IT support. In all cases, users may contact IT Services in the first instance about any aspect of the Oxford Nexus Service if they so choose. This may, for example, be the most efficient route to resolve most basic problems. In more complex cases IT Services may refer the user to their primary IT support or require the involvement of local IT support in order to resolve the issue.

2. Summary of IT Services’ responsibilities

2.1. Service availability

Hours of Service

The service operates at all times.

Oxford Nexus Service systems staff cover is normally available from 0900 to 1700 on working days. Minimal operational cover operates from 0830 to 2030 on working days. Automatic monitoring of the main service elements takes place outside these hours, and informal arrangements exist for staff to be called, but no funding is provided to make this contractual.

The IT Services help desk service currently operates 0830-2030 Monday-Friday all year round except for bank holidays and Christmas closure (approximately 24th December - 2nd January). Please see the IT Services/OUCS Help Centre SLD for further details of the Help Centre responsibilities, <>.

If a fault is notified between 0900 and 1700 on a working day, IT Services will commence investigation within one hour (provided that no similar fault is also being handled by the same team).

If a fault is notified outside these hours, IT Services will use reasonable endeavours to rectify the fault, but no funding is allocated to this purpose.


The Oxford Nexus Service hardware is located in two physical locations within the Oxford network. Complete failure at one site should result in failover to the second site with minimal loss of service. Within each site components such as servers and storage have been deployed with resilience and business continuity in mind.

Hardware and Software Maintenance

The hardware on which the Oxford Nexus Service is hosted is supported by maintenance contracts from the relevant vendors.

Software updates are provided by the relevant vendor and applied by IT Services. Where possible the JANET maintenance period (Tuesdays, 0700-0900) is reserved for maintenance work that may affect service availability. Except in the case of emergency maintenance (e.g. security fixes), scheduled downtime will be advertised at least a week in advance.

Alternative facilities and migrations from local services

Some departments and colleges run their own Exchange or other email service. Where a unit wishes to migrate from their local service to Nexus IT Services will provide advice to departments and colleges on a reasonable efforts basis, including an initial assessment of the complexity and likely resources required to undertake any such migration, as well as providing supporting materials relating to the preferred methods of undertaking any migration process. However, no specific resources have been allocated for IT Services to undertake a migration from a department service to the Nexus Service or for enabling interoperability between Nexus and a local Exchange instance, for example. Departments wishing to migrate from a local service or who wish to use Nexus beyond the scope of the service defined in this SLD would be expected to commit the required resources to enable any IT Services support for such activities (where feasible). Some useful background information, including indicators of the level of support IT Services can provide to migrating units is described at <>. Departments seeking a hosting facility for their own Exchange or email service should contact NSMS in the first instance.

2.2. Administration information and support documentation

Information and support documentation

Support documentation for all aspects of the Oxford Nexus Service is provided online at <>.

The IT Services IT Learning Programme provides a range of courses relevant to use of the Oxford Nexus Service, <>.

Fault notification

Notification of major faults, service outage etc are circulated to the itss- mailing list and placed on the IT Services Status website, <>.

Fault reporting

Problems with the Service should be reported to the IT Services Help Centre, <>, in the first instance where, if appropriate, the issue will be escalated to the Oxford Nexus Service team for specialist diagnostics and advice.

2.3. Service components

Nexus Account Administration

Account management is delegated to IT Services Registration services. The SLD for the Registration Service specifies the list of services offered <>. These include, but are not confined to:

  • Automated and manual provisioning of Oxford Single Sign-on credentials;
  • Automated and manual provisioning of Oxford email address;
  • Bulk creation of Single Sign-on and email accounts for new students;
  • Issuing of activation and rescue codes for SSO accounts;
  • Changes to mail routing;
  • Changes to email address;
  • Provision of additional department or college email addresses;
  • Provision of non-personal accounts and generic email addresses for college or department;
  • Discretionary extension of accounts;
  • Discretionary increases to mailbox quotas

In addition, the Self Registration facility (<>) provides the following Nexus-specific end-user functionality:

  • Set spam filter level
  • Set preferred email address
  • Set email forwarding address
  • Show email usage and quota
  • Show mailbox information
  • Show active sync connection information

Registered ITSS may make use of functionality supported by Registration Services to undertake a number of the above actions on behalf of their own users. In particular, ITSS can currently:

  • View and set mail routings for their users
  • View (but not change) their users' routing for other units
  • View and update the routings for generic email addresses
  • Issue Activation or Rescue code for SSO accounts of their users
  • Request additional chargeable quota on behalf of their users

Exchange Functionality

The following table outlines services or functionality provided to end users through Exchange where IT Services is expected to provide the primary means of support.

Table 1.
Service Description Primary user support
IMAP, SMTP, POP3, ‘Outlook Anywhere’, Outlook Web Access (incl. OWA lite) Standard Exchange services provided by the Nexus team. IT Services
Quota usage Enabling end-users to view quota usage. IT Services
Out of office message Automated email reply to indicate user away from email. Functionality is enabled/disabled by user. IT Services
Spam scoring and filtering Scoring of incoming mail via the Oxmails and filtering via Exchange. IT Services
Blacklisting and Whitelisting Safe senders may be specified by user IT Services
Anti-virus Virus checking at the Oxmails and at the Exchange servers IT Services
Backup and recovery Users may restore accidentally deleted items up to seven days after the event via the Exchange Restore Deleted Items functionality. After this period, restores are reliant on the backup service as provided by the HFS Backup and Archiving Service <>. Backups are retained, primarily for the purpose of system restores. IT Services operates a chargeable service for the attempted recovery of user deleted items from system backups, <>. Whole mailboxes may be restored to a specific historical date up to a maximum of 30 days ago (subject to scheduling of a particular requested backup). Beyond this point, mailbox backups are available at 11 day intervals, up to a minimum of 22 days and a maximum of 33 days in the past. IT Services
Deleted Items and junk mail retention policy IT Services purges items in users' Deleted Items and Junk Mail folders after 30 days but items will be recoverable using "Recover Deleted Items" within that time frame. IT Services
Resource booking Provision of mailbox accounts to manage room and other resource bookings IT Services
BlackBerry Enterprise Server hosting Nexus' BlackBerry Enterprise Server was retired in February 2018. IT Services
BlackBerry user creation Nexus' BlackBerry Enterprise Server was retired in February 2018. Provisioned by IT Services under instruction from ITSS
BlackBerry server administration Nexus' BlackBerry Enterprise Server was retired in February 2018. Provisioned by IT Services under instruction from ITSS
BlackBerry support documentation Nexus' BlackBerry Enterprise Server was retired in February 2018. IT Services

Exchange Client Support

For Exchange client support the first port of call for documentation is the IT Services/OUCS web site <>.

Table 2.
Service Description Primary user support
Email client documentation IT Services maintains documentation on a selection of clients for use with Exchange. These include Microsoft Outlook (via Outlook Anywhere), clients using Exchange Web Services, mobile email clients and at least one IMAP client. IT Services
Training IT Services IT Learning Programme provides training for group working as well as training in the most effective use of selected clients. IT Services

Inactive mailbox retention period

The Nexus mailboxes associated with those whose University Card has expired (or status changed so that they are no longer eligible for a Nexus mailbox) are not deleted immediately. The following procedure is followed:

  • A default 2 month grace period is permitted, during which time the mailbox remains active and email may be forwarded to another (external) address and/or an Out of Office (OOF) message set to inform senders that the mailbox may no longer be monitored.
  • During the grace period, even though the mailbox remains active, no direct access is available to the expired/departed user.
  • At the end of the grace period, the mailbox is flagged for deletion and messages sent to the mailbox receive a ‘Recipient unknown’ (#550) message
  • The mailbox is deleted from the live system one month after the end of the grace period
  • The mailbox data still remain within system backup tapes for a further 80-90 days after deletion on line.

Shared mailbox logging

Mailboxes that are shared using the privileges of Full Access have 'mailbox auditing' logs switched on by default, with the exception of resource mailboxes (used for room bookings etc.). Audit logs enable better support for shared mailboxes (e.g. identifying the cause of missing items) and ensure that in the event of a security incident associated with the mailbox there is a record of access to, and activity within, the mailbox. Logs are not routinely analysed and are only ever accessed either in order to provide support, with the permission of the mailbox owner, or as part of an investigation arising from a security incident (in line with the University's IT Regulations).

Log retention

Logs which are created by the Exchange system are kept for around 90 days under normal circumstances. This includes the mailbox audit logs (see 'Shared mailbox logging', above) which log in a 90-day 'circular' fashion. (See also 'Backup and recover' above for the retention times for mailbox backups).

3. Summary of client’s responsibilities

The client's responsibilities vary according to the type of service. Clients in this context may be department or college IT Support Staff or individual end-users.

The following table lists services provided by, or related to, the Oxford Nexus Service but where it is expected that the primary means of support to the end-user will be provided by local IT support or similar.

Exchange Functionality

Table 3.
Service Description Primary user support
Distribution lists These are managed by the user/owner within the user-visible Microsoft Exchange interfaces. ITSS
Personal calendars Standard personal calendars within Exchange ITSS
Shared calendars Calendars within Exchange to be shared with and/or administered by multiple individuals or groups. ITSS
Delegated access to email and/or calendars Users may choose to delegate access to their mailbox and/or calendar to other authorised users (e.g. PA, ITSS). ITSS

Exchange client support


Table 4.
Service Description Primary user support
Email client maintenance On departmental and college owned machines ITSS
Email client maintenance On privately owned machines User (in conjunction with IT Services support documentation for recommended clients)
Email signatures The placement of signatures at the bottom of users’ email ITSS
BlackBerry purchase Purchasing of the individual devices. Department or college
BlackBerry contracts with service providers Contracts and payments to carriers (e.g. Vodafone, O2, Orange etc.) Department or college
BlackBerry CAL Blackberry Enterprise Server user licence. Department or college
Mobile device client configuration Enabling BlackBerry or other mobile devices to interoperate with Exchange ITSS
Wiping of data from mobile device Remote removal of data from mobile device following loss ITSS
Trans-migration training Training before, during and shortly after the migration of units to and from Nexus IT Services provides generic training; department or college responsible where on-site, customised training required
Bespoke training Customised training to meet specific local requirements Department or college

Acceptable use

The use of the Oxford Nexus Exchange Service is subject to, and implies, acceptance of any applicable regulations, including but not limited to:

In general, users are expected to:

  • manage their storage space within the quota limits allocated;
  • limit the number of items in any one folder to no more than 100,000, or 500 if an IMAP client is in use. (To ensure adequate system performance, it may be necessary to suspend access to the service for any user who exceeds these limits and is identified in system logs as causing a fault);
  • to refrain from activity detrimental to others or to the reputation of the University (as detailed in the University Regulations Relating to the Use of Information Technology Facilities);
  • keep secure and private their Oxford username (SSO) password.

Users are encouraged to:

  • keep the number of folders within their mailbox to fewer than 500, beyond which performance problems may become apparent. N.B. Where mailboxes are delegated or shared, the guideline maximum number of folders per mailbox may be considerably lower than the 500 figure.

4. Premium services

The following Premium (chargeable) service is available:

  • A chargeable large quota service is available for users requiring in excess of the 3GB discretionary quota. Any quota assigned above 3GB is charged to the user's sponsoring unit. Currently the charge is £1.50 per GB per month (or part thereof). Authorisation to use this service is submitted on the user's behalf by the sponsoring unit (generally the ITSS).


Service area: 

Written by IT Services. Latest revision 6 March 2018