Questions concerning using Office 365 for email.
While current Mailbox sizes range from 200MB to 5GB, Office 365 accounts have access to 50GB of space. Archived email does not count towards this 50GB limit and there is no limit for archived email.
Currently, attachments are limited to 10MB in size. After the migration to Office 365 you will be able to attach up to 150MB on the Outlook client or 25MB if you are using the web client (OWA).
The archiving process in Office 365 works a little differently for the webmail and for the Outlook application. We are creating tutorials for each method.
Viewing the emails that you archived using the new method in Office 365 is as simple as navigating to the Archive folder. See the tutorial for using archiving in Office 365 for more details.
The process of moving PSTs to cloud accounts is still a new feature for Office 365. At this time our recommendation is to leave your PSTs on your local Machine. You will be able to continue accessing them with Outlook.
At this time there is no way to increase the mailbox size.
Emails removed from the Deleted Items folder have a 14 day retention period. After that they are unrecoverable.