The following capacity limits apply to UW Exchange Online.
|Message size||25 MB|
|Subject length||255 characters|
|File attachments (per message?)||250|
|Multipart message||250 parts|
|Embedded message depth||30 messages|
|Recipient rate limit||10,000 per day|
|Message rate||30 per minute|
|Messages per mailbox folder||1 million|
|Subfolders per mailbox folder||1000|
|Folder hierarchy depth||300|
|Concurrent MAPI connections to a Mailbox||32|
|Calendars that can be viewed or linked||255|
|Deleted Items folder retention period||Unlimited||Although UW Exchange Online is currently configured to retain deleted items, do not depend on that configuration for archive or business critical processes. Microsoft may revert this setting to 30 days or less without notification, resulting in the loss of older data.|
|Retention period for items removed from the Deleted Items folder||14 days||UW Exchange Online is configured currently configured for the default 14-day retention policy. However as of June 5, 2014, UW-IT is in the process of updating all accounts to use the maximum 30 days allowed. It is important to note that retention of calendar items is always 120 days.|
|Junk Email folder retention period||120 days||Although UW Exchange Online is currently configured to retain junk items for 120 days, users should not depend on that configuration for archive or business critical processes. Microsoft may revert this setting to 30 days or less without notification, resulting in the loss of older data.|
|Mailbox calendar delegates||4||Outlook does not limit the number of delegates that you can add. However, Microsoft recommends that you grant Editor permissions to only one delegate, as described in Best practices when using the Outlook Calendar. You may find acceptable performance for more delegates, but it is common to experience increased numbers of corrupted or inappropriately processed meeting events with increased numbers of delegates.
It is not supported to have a user as both a delegate and full mailbox access.