CSU Logo - click to visit the CSU homepage

Office 365 and Central Exchange Services at CSU is the primary resource for faculty and staff to find information regarding Exchange and Office 365 services. If you have questions or if you are looking for information not listed here, please contact the CSU Central IT Help Desk at

News, Announcements, and Updates

6/16/2017 - New OneDrive for Business Sync Client Required After 9/12/2017: ACNS is planning to update sync settings affecting Office 365 OneDrive for Business on 9/12/17 that will disable syncing for users still using legacy sync clients. The new sync client has been available for install since Spring 2016 and the planned update is necessary to allow users to sync both SharePoint site libraries and OneDrive storage on their PCs. Please refer to Upgrade to New OneDrive Sync Client for more information.

5/22/2017 - Office 365 Modern Authentication: ACNS will enable the modern authentication option in Exchange Online and Skype for Business on 5/30/2017. Please refer to Office 365 Modern Authentication for more information.

5/2/2017 - Shibboleth Login at Help.Mail: This site has been transitioned to use the Shibboleth login form when authentication is required to access the Resource Coordinator Tools or other pages requiring a user to login with their eID. Please refer to Single Sign-On using Shibboleth for more information.

3/22/2017 - Microsoft Teams Update: Microsoft recently released a new feature to Office 365 called Microsoft Teams. Please note that Microsoft Teams is currently disabled in CSU's Office 365 tenant while ACNS tests Teams functionality and interoperability with identity management and Office 365 provisioning systems. We will post more information to this site regarding the potential use of Microsoft Teams at CSU as it becomes available.

2/17/2017 - Mailbox Quota Increase: Mailbox quotas have been increased to 100GB for all CSU users with an Office 365 mailbox. The previous quota was 50GB.

2/15/2017 - Exchange Calendaring Best Practices Reminder: This is a reminder that Exchange Calendaring Best Practices are available, and the best practices are still applicable to Office 365 Exchange. For users experiencing calendaring issues such as missing or "moving" meetings, the best practices document is a good place to start.

1/18/2017 - Office 365/Exchange support transitioning to Central IT Help Desk starting Thursday, January 19: Office 365 and Exchange support requests traditionally sent to should be addressed to (the address for the Central IT Help Desk) starting January 19. The Central IT Help Desk will respond to support requests and escalate issues to the appropriate teams within ACNS as needed. E-mail sent to the address after the 19th, will be redirected to Central IT Help Desk as well. Departmental IT Admins who have used to the address to contact the ACNS Windows team should direct questions and requests to going forward.

12/5/2016 - Maximum Message and Attachment Size Limits Increased: Message size limits have been increased for Office 365 users to allow up to 150MB attachments when using Outlook (Windows) to send e-mail between CSU Office 365 users. Please refer to Mailbox and Message Size Limits for more information, includuing restrictions set for e-mail clients such as Outlook for Mac.

11/28/2016 - Yammer Users Must Login using CSU eID: As of 11/28/2016, all users who utilize Yammer (an Office 365 service) will need to have an active eID and login to Yammer with their username in the format of Microsoft is deprecating legacy login methods, which in some cases allowed users to access Yammer by logging in as and/or after their CSU eID was no longer active.

10/21/2016 - Office 365 Groups: Office 365 Groups, which provide a group mailbox, shared file space, calendar, notebook, and an Office 365 plan are now available. Please refer to Office 365 Groups for more information about creating and using groups.

9/21/2016 - Archive Mailboxes: For users needing more than 100GB of space in their mailbox, we are now offering Archive Mailboxes to provide additional space. Refer to Using Archive Mailboxes in Office 365 for more information.

9/8/2016 - Office 365 SharePoint / MS Project sites now available: Sharepoint Online services are now available. Please visit Office 365 Sharepoint Online for more details.