General FAQ
Sometimes I need to send emails to large numbers of people. Does Outlook limit the number of emails I can send?
Yes, Outlook limits the number of recipients per message to 500 and sets a daily recipient limit of 10,000 recipients. If you have email sending needs that exceed these limits, we recommend using one of CU Boulder's bulk/mass email communication services.
Are certain attachment types blocked by Microsoft 365?
Yes, both Microsoft Outlook and Microsoft Defender Quarantine will block or quarantine messages that contain file types that are commonly used to package malicious content.
When Microsoft Defender Quarantine detects a potentially malicious file type, it will quarantine the original email message and flag it as malware. Archive and compression files that include any of these file types will also be quarantined.
Quarantined messages flagged as malware require administrative intervention to be released. Users can request that a message be released from the quarantine portal, as shown in this tutorial: Microsoft Defender Quarantine - Release and Delete Emails.
How much storage space does my Microsoft account have?
All Microsoft 365 accounts by default have 50GB of storage for email and calendar data. Please note: This limit cannot be increased.
Visit the Outlook on the web - Check Mailbox Usage tutorial tutorial to learn how to check the capacity of your mailbox or use Microsoft's Manage My Mailbox Size page for additional help.
How long do messages stay in the Deleted Items folder?
The deleted items folder retention period is 30 days. After that, messages are automatically removed from the folder. Items that have been automatically removed from the Deleted Items folder are retained for 30 days before being permanently deleted. You can recover items during the retention period using Outlook or Outlook on the web. Visit the Recovering Deleted Items tutorial for instructions.
What do I need to know if I use delegates to manage my calendar?
OIT has created an Outlook Calendaring Best Practices guide to provide guidance to Outlook calendar users on the practices and email/calendar clients that best avoid calendaring problems. They have been collected from many years of experience with Outlook and from multiple sources.
What is Microsoft Defender Quarantine?
Microsoft Defender Quarantine is a feature that is integrated with Outlook to protect users from harmful emails and spam. It automatically holds suspicious emails in quarantine until the user can review them and decide whether to allow them to be delivered to their inbox.
By enabling Defender Quarantine on the Outlook client, OIT is empowering end users to release messages they previously would not have seen. Learn more on the Microsoft Defender Quarantine page.
