You may have seen the O365 Notification –
“Microsoft Outlook
Outlook is trying to retrieve data from Microsoft Exchange server outlook.office365.com”
This is a fairly common message to O365 Administrators and users, telling you that the O365 mailboxes are being slow to respond. Symptoms can include a user’s Outlook client freezing temporarily, or being very slow. In some extreme cases Outlook clients need to be restarted.
Please bear in mind, if Formate is connected to an O365 mailbox, it is considered a simple user and will see similar events, possible breaking the connection, but certainly interrupting processing.