Frequently Asked Questions
What are the Office 365 mailbox quota limits?
The Office 365 quota limits are as follows:
Mailbox limit - 25GB
Maximum number of message recients per day - 1500
Maximum number of recipients per message - 500
Maximum size of attachment - 25MB
Despite the large mailbox quotas on Office 365, you should proactively manage your email, for example:
By emptying your deleted items folder regularly.
By sorting through Mail folders (including Sent Mail) and deleting any messages no longer required.