Outlook for Mac accounts connected to Exchange may sometimes get error messages stating that their Exchange mailbox is full. And IT support team may have to ask the email client users to delete unnecessary emails and attachments or to archive their mailbox data. Here, we will go through the causes of this issue and ways to deal with it.

Why the Exchange mailbox is full?

An Exchange connected user mailbox cannot accommodate more messages when its size reaches the mailbox quota allocated by the Exchange administrator for it. Then, users will have to reduce their mailbox size from the Outlook for Mac email client itself. Deleting unwanted emails and separating attachments from mails can help to some extent. However, a better approach would be to archive the old Outlook for Mac mailbox data and retain only the recent and most relevant items in the mailbox. Let us see how you can check the size of your Outlook for Mac mailbox folders and archive their items.

How to check the size of mailbox folders in Outlook for Mac?

In Outlook for Mac, users don’t have the facility to check the size of the entire mailbox. They have to do it individually for each folder. For this, right-click the folder, select Folder Properties, and go to Storage tab on the Folder Properties dialogue box. Here one can view the size of the folder as well as the sizes of its subfolders.

How to archive Outlook for Mac mailbox folder data?

The method for archiving folders in Outlook for Mac is given below:

1. Begin by choosing one or more messages to archive.
2. From the top ribbon, select Archive.
3. Click on Continue on the prompt (This will let you create you a new archive folder).
4. Now, to set archiving rules go to Tools and select Rules, further select Edit Rules.
5. Then select Exchange from the left menu pane, then click on ‘+’ to add a new rule.
6. Assign a Rule name and specify the required conditions. Then click on OK to save the rule.
7. To apply the rule to a folder, select all its emails and click Message > Rules > Apply > Select Rule.

How to backup OLM files in PST?

Many OLM users may want to back up their OLM files as PST files. By doing so, they can access their emails in MS Outlook (Windows environment). The process is given below:

1. Begin by signing in to your Gmail account so as to configure the IMAP email account.
2. Then configure your Mac Outlook OLM file with the same Gmail account.
3. Now, create a Gmail label and then start synchronizing the OLM file with IMAP
4. Now, move all OLM file data to IMAP account and then move OLM emails from IMAP mailbox to MS Outlook PST

Also, you can opt for a third party tool Kernel for OLM to PST converter for the conversion of OLM files to PST. This tool helps you to convert OLM files to PST format. It helps migrate all Outlook for Mac items including emails, attachments, calendars, etc. to the Windows environment.