Evolution MAPI Features
With Evolution MAPI providers, you can view the size of a selected folder.
You can view the folder size by using the following methods:
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Select Edit > Preferences > MAPI Account > Edit.
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Select the Exchange settings tab.
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Select Folder size.
Alternatively, right-click the MAPI Account in the folder tree, then select folder size.

A Folder dialog is displayed with details, such as folder name and their respective size. It also provides you the total mailbox size.