Maximum number of messages that can be sent from your email client per minute: 30 Maximum number of addresses allowed in the To:, Cc:, and Bcc: fields (combined): 500 per message If you have legitimate large mailings to do, please understand these limits and the alternatives you have for delivering your messages.
Office 365 includes some security defenses that limit the ability of an individual to send huge numbers of messages in a short amount of time. Maximum number of attachments on a single message: 250.If you need to send files larger than 25 MB, use Cornell Box (cloud storage that you can share) or Cornell Secure File Transfer instead (for sizes up to 5 GB). See our Attachments Not Getting Through article for details. The limit applies for both outgoing and incoming messages. Message size limit: 25 MB (total size including attachments).
If you're likely to want the message longer than 30 days, you should keep it in your Inbox or another folder instead of clicking Delete.) Thirty days later, the message will be removed from your Deleted Items folder. (Explanation: When you click Delete on a message, or when you respond to a calendar invitation, it is automatically placed in your Deleted Items folder.
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See how to get connected with your iOS device or how to get connected with your Android or other device. Mobile devices: works with Android, iPhone, Windows Phone, and other devices that support ActiveSync.